All 1,000 fish
Sorted by how often keepers ask about them. Filter by what you can house, tick up to four to compare, or open any fish for its full sheet. Sizes are adult lengths and tank minimums are for keeping the fish long term.
Showing 1,000 of 1,000 fish.
Compare
| Compare | ||||||
|---|---|---|---|---|---|---|
| Black Skirt Tetra Gymnocorymbus ternetzi | Freshwater | 6 | 70 | Semi-aggressive | Suits a first tank | |
| Blue Tang Paracanthurus hepatus | Marine | 28 | 700 | Semi-aggressive | Some experience helps | |
| Bronze Corydoras Corydoras aeneus | Freshwater | 6.5 | 70 | Peaceful | Suits a first tank | |
| Cardinal Tetra Paracheirodon axelrodi | Freshwater | 4 | 60 | Peaceful | Some experience helps | |
| Cherry Barb Puntius titteya | Freshwater | 4.5 | 60 | Peaceful | Suits a first tank | |
| Dwarf Gourami Trichogaster lalius | Freshwater | 7 | 60 | Peaceful | Some experience helps | |
| Freshwater Angelfish Pterophyllum scalare | Freshwater | 15 | 150 | Semi-aggressive | Some experience helps | |
| Goldfish Carassius auratus | Freshwater | 25 | 200 | Peaceful | Suits a first tank | |
| Green Swordtail Xiphophorus hellerii | Freshwater | 12 | 90 | Peaceful | Suits a first tank | |
| Guppy Poecilia reticulata | Freshwater | 4.5 | 40 | Peaceful | Suits a first tank | |
| Harlequin Rasbora Trigonostigma heteromorpha | Freshwater | 4.5 | 60 | Peaceful | Suits a first tank | |
| Kuhli Loach Pangio kuhlii | Freshwater | 10 | 70 | Peaceful | Some experience helps | |
| Molly Poecilia sphenops | Freshwater | 7.5 | 90 | Peaceful | Suits a first tank | |
| Neon Tetra Paracheirodon innesi | Freshwater | 3 | 45 | Peaceful | Some experience helps | |
| Ocellaris Clownfish Amphiprion ocellaris | Marine | 9 | 80 | Semi-aggressive | Suits a first tank | |
| Peppered Corydoras Corydoras paleatus | Freshwater | 6 | 70 | Peaceful | Suits a first tank | |
| Platy Xiphophorus maculatus | Freshwater | 5 | 60 | Peaceful | Suits a first tank | |
| Siamese Fighting Fish Betta splendens | Freshwater | 6.5 | 20 | Semi-aggressive | Suits a first tank | |
| Tiger Barb Puntigrus tetrazona | Freshwater | 6.5 | 100 | Semi-aggressive | Suits a first tank | |
| White Cloud Mountain Minnow Tanichthys albonubes | Freshwater | 3.5 | 45 | Peaceful | Suits a first tank | |
| Zebra Danio Danio rerio | Freshwater | 4.5 | 60 | Peaceful | Suits a first tank | |
| Bala Shark Balantiocheilos melanopterus | Freshwater | 30 | 600 | Peaceful | Some experience helps | |
| Banggai Cardinalfish Pterapogon kauderni | Marine | 7.5 | 100 | Peaceful | Suits a first tank | |
| Black Neon Tetra Hyphessobrycon herbertaxelrodi | Freshwater | 3.5 | 60 | Peaceful | Suits a first tank | |
| Black Phantom Tetra Megalamphodus megalopterus | Freshwater | 3.6 | 60 | Peaceful | Suits a first tank | |
| Blue Green Chromis Chromis viridis | Marine | 9 | 150 | Peaceful | Suits a first tank | |
| Boesemani Rainbowfish Melanotaenia boesemani | Freshwater | 9 | 150 | Peaceful | Some experience helps | |
| Celestial Pearl Danio Danio margaritatus | Freshwater | 2.5 | 45 | Peaceful | Some experience helps | |
| Chinese Algae Eater Gyrinocheilus aymonieri | Freshwater | 20 | 200 | Aggressive | Some experience helps | |
| Clown Loach Chromobotia macracanthus | Freshwater | 25 | 450 | Peaceful | Some experience helps | |
| Common Pleco Hypostomus plecostomus | Freshwater | 35 | 450 | Peaceful | Suits a first tank | |
| Convict Cichlid Amatitlania nigrofasciata | Freshwater | 10 | 120 | Aggressive | Suits a first tank | |
| Discus Symphysodon aequifasciatus | Freshwater | 15 | 250 | Peaceful | Experienced keepers only | |
| Ember Tetra Hyphessobrycon amandae | Freshwater | 2 | 40 | Peaceful | Suits a first tank | |
| Firefish Goby Nemateleotris magnifica | Marine | 7.5 | 75 | Peaceful | Suits a first tank | |
| Foxface Rabbitfish Siganus vulpinus | Marine | 20 | 350 | Peaceful | Suits a first tank | |
| German Blue Ram Mikrogeophagus ramirezi | Freshwater | 5 | 60 | Peaceful | Experienced keepers only | |
| Glowlight Tetra Hemigrammus erythrozonus | Freshwater | 3.5 | 60 | Peaceful | Suits a first tank | |
| Green Mandarin Synchiropus splendidus | Marine | 7 | 120 | Peaceful | Experienced keepers only | |
| Honey Gourami Trichogaster chuna | Freshwater | 5 | 60 | Peaceful | Suits a first tank | |
| Julii Cory Corydoras julii | Freshwater | 5 | 75 | Peaceful | Suits a first tank | |
| Oscar Astronotus ocellatus | Freshwater | 30 | 300 | Aggressive | Some experience helps | |
| Panda Cory Corydoras panda | Freshwater | 4.5 | 60 | Peaceful | Suits a first tank | |
| Pearl Gourami Trichopodus leerii | Freshwater | 11 | 120 | Peaceful | Suits a first tank | |
| Percula Clownfish Amphiprion percula | Marine | 8 | 80 | Peaceful | Suits a first tank | |
| Pygmy Corydoras Corydoras pygmaeus | Freshwater | 2.5 | 45 | Peaceful | Suits a first tank | |
| Rainbow Shark Epalzeorhynchos frenatum | Freshwater | 15 | 200 | Semi-aggressive | Some experience helps | |
| Red Eye Tetra Bario sanctaefilomenae | Freshwater | 5.5 | 80 | Peaceful | Suits a first tank | |
| Red Tail Shark Epalzeorhynchos bicolor | Freshwater | 13 | 200 | Semi-aggressive | Some experience helps | |
| Rosy Barb Pethia conchonius | Freshwater | 10 | 150 | Peaceful | Suits a first tank | |
| Royal Gramma Gramma loreto | Marine | 8 | 80 | Peaceful | Suits a first tank | |
| Rummy-Nose Tetra Petitella bleheri | Freshwater | 4.5 | 70 | Peaceful | Some experience helps | |
| Sailfin Molly Poecilia latipinna | Freshwater | 12 | 120 | Peaceful | Some experience helps | |
| Sailfin Pleco Pterygoplichthys gibbiceps | Freshwater | 45 | 600 | Peaceful | Suits a first tank | |
| Sixline Wrasse Pseudocheilinus hexataenia | Marine | 7.5 | 120 | Semi-aggressive | Suits a first tank | |
| Sterba's Cory Corydoras sterbai | Freshwater | 6.5 | 80 | Peaceful | Suits a first tank | |
| Three Spot Gourami Trichopodus trichopterus | Freshwater | 12 | 120 | Semi-aggressive | Suits a first tank | |
| Variable Platyfish Xiphophorus variatus | Freshwater | 5.5 | 60 | Peaceful | Suits a first tank | |
| Volitan Lionfish Pterois volitans | Marine | 35 | 450 | Predator | Some experience helps | |
| X-Ray Tetra Pristella maxillaris | Freshwater | 4.5 | 60 | Peaceful | Suits a first tank | |
| Yellow Lab Labidochromis caeruleus | Freshwater | 9 | 150 | Semi-aggressive | Suits a first tank | |
| Yellow Tang Zebrasoma flavescens | Marine | 18 | 380 | Semi-aggressive | Some experience helps | |
| Agassiz's Dwarf Cichlid Apistogramma agassizii | Freshwater | 6 | 60 | Semi-aggressive | Some experience helps | |
| Asian Arowana Scleropages formosus | Freshwater | 70 | 900 | Predator | Experienced keepers only | |
| Auratus Cichlid Melanochromis auratus | Freshwater | 11 | 200 | Aggressive | Some experience helps | |
| Bicolor Angelfish Centropyge bicolor | Marine | 14 | 250 | Semi-aggressive | Experienced keepers only | |
| Bicolor Blenny Ecsenius bicolor | Marine | 9 | 100 | Peaceful | Suits a first tank | |
| Black Ruby Barb Pethia nigrofasciata | Freshwater | 6 | 80 | Peaceful | Suits a first tank | |
| Bleeding Heart Tetra Megalamphodus erythrostigma | Freshwater | 6 | 100 | Peaceful | Suits a first tank | |
| Bloodfin Tetra Aphyocharax anisitsi | Freshwater | 5 | 70 | Peaceful | Suits a first tank | |
| Blue Acara Andinoacara pulcher | Freshwater | 14 | 150 | Semi-aggressive | Suits a first tank | |
| Blue Damselfish Chrysiptera cyanea | Marine | 7 | 100 | Aggressive | Suits a first tank | |
| Bluestreak Cleaner Wrasse Labroides dimidiatus | Marine | 11 | 200 | Peaceful | Experienced keepers only | |
| Buenos Aires Tetra Psalidodon anisitsi | Freshwater | 8 | 120 | Semi-aggressive | Suits a first tank | |
| Clark's Clownfish Amphiprion clarkii | Marine | 13 | 120 | Semi-aggressive | Suits a first tank | |
| Clown Killifish Epiplatys annulatus | Freshwater | 3.5 | 35 | Peaceful | Some experience helps | |
| Cockatoo Dwarf Cichlid Apistogramma cacatuoides | Freshwater | 7.5 | 70 | Semi-aggressive | Some experience helps | |
| Colombian Tetra Hyphessobrycon columbianus | Freshwater | 6.5 | 90 | Semi-aggressive | Suits a first tank | |
| Common Pleco Pterygoplichthys pardalis | Freshwater | 40 | 500 | Peaceful | Suits a first tank | |
| Congo Tetra Phenacogrammus interruptus | Freshwater | 8 | 150 | Peaceful | Some experience helps | |
| Copperband Butterflyfish Chelmon rostratus | Marine | 18 | 350 | Peaceful | Experienced keepers only | |
| Coral Beauty Angelfish Centropyge bispinosa | Marine | 10 | 150 | Semi-aggressive | Suits a first tank | |
| Denison Barb Dawkinsia denisonii | Freshwater | 12 | 250 | Peaceful | Some experience helps | |
| Diamond Watchman Goby Valenciennea puellaris | Marine | 15 | 150 | Peaceful | Some experience helps | |
| Dojo Loach Misgurnus anguillicaudatus | Freshwater | 20 | 200 | Peaceful | Suits a first tank | |
| Domino Damselfish Dascyllus trimaculatus | Marine | 12 | 150 | Aggressive | Suits a first tank | |
| Electric Blue Hap Sciaenochromis ahli | Freshwater | 18 | 300 | Semi-aggressive | Some experience helps | |
| Emerald Green Cory Corydoras splendens | Freshwater | 8 | 100 | Peaceful | Suits a first tank | |
| Emperor Angelfish Pomacanthus imperator | Marine | 35 | 800 | Semi-aggressive | Experienced keepers only | |
| Emperor Tetra Nematobrycon palmeri | Freshwater | 4.5 | 70 | Peaceful | Suits a first tank | |
| Eureka Red Peacock Aulonocara jacobfreibergi | Freshwater | 13 | 250 | Semi-aggressive | Some experience helps | |
| Fairy Cichlid Neolamprologus brichardi | Freshwater | 9 | 120 | Semi-aggressive | Some experience helps | |
| Firemouth Cichlid Thorichthys meeki | Freshwater | 14 | 150 | Semi-aggressive | Suits a first tank | |
| Flame Angelfish Centropyge loriculus | Marine | 10 | 150 | Semi-aggressive | Some experience helps | |
| Flame Tetra Hyphessobrycon flammeus | Freshwater | 2.8 | 50 | Peaceful | Suits a first tank | |
| Flying Fox Epalzeorhynchos kalopterum | Freshwater | 14 | 150 | Semi-aggressive | Some experience helps | |
| Forktail Blue-Eye Pseudomugil furcatus | Freshwater | 5 | 60 | Peaceful | Some experience helps | |
| Four Stripe Damselfish Dascyllus melanurus | Marine | 7.5 | 120 | Aggressive | Suits a first tank | |
| Ghost Catfish Kryptopterus minor | Freshwater | 7 | 100 | Peaceful | Some experience helps | |
| Gold Barb Barbodes semifasciolatus | Freshwater | 7 | 80 | Peaceful | Suits a first tank | |
| Golden Otocinclus Otocinclus affinis | Freshwater | 4.5 | 50 | Peaceful | Some experience helps | |
| Golden Pencilfish Nannostomus beckfordi | Freshwater | 4.5 | 60 | Peaceful | Suits a first tank | |
| Green Terror Andinoacara rivulatus | Freshwater | 20 | 300 | Aggressive | Some experience helps | |
| Jack Dempsey Rocio octofasciata | Freshwater | 20 | 250 | Aggressive | Some experience helps | |
| Japanese Medaka Oryzias latipes | Freshwater | 3.5 | 40 | Peaceful | Suits a first tank | |
| Julii Corydoras Corydoras trilineatus | Freshwater | 5.5 | 70 | Peaceful | Suits a first tank | |
| Kenyi Cichlid Maylandia lombardoi | Freshwater | 11 | 250 | Aggressive | Some experience helps | |
| Kissing Gourami Helostoma temminckii | Freshwater | 20 | 300 | Semi-aggressive | Suits a first tank | |
| Lake Kutubu Rainbowfish Melanotaenia lacustris | Freshwater | 10 | 150 | Peaceful | Suits a first tank | |
| Lambchop Rasbora Trigonostigma espei | Freshwater | 3 | 50 | Peaceful | Suits a first tank | |
| Lawnmower Blenny Salarias fasciatus | Marine | 12 | 150 | Peaceful | Some experience helps | |
| Lemon Cichlid Neolamprologus leleupi | Freshwater | 10 | 120 | Semi-aggressive | Some experience helps | |
| Lemon Tetra Hyphessobrycon pulchripinnis | Freshwater | 3.8 | 60 | Peaceful | Suits a first tank | |
| Lyretail Anthias Pseudanthias squamipinnis | Marine | 12 | 300 | Peaceful | Some experience helps | |
| Maroon Clownfish Amphiprion biaculeatus | Marine | 15 | 150 | Aggressive | Suits a first tank | |
| Midas Blenny Ecsenius midas | Marine | 12 | 150 | Peaceful | Suits a first tank | |
| Neon Dwarf Rainbowfish Melanotaenia praecox | Freshwater | 6 | 80 | Peaceful | Suits a first tank | |
| Neon Goby Elacatinus oceanops | Marine | 4.5 | 40 | Peaceful | Suits a first tank | |
| Norman's Lampeye Poropanchax normani | Freshwater | 3.5 | 45 | Peaceful | Suits a first tank | |
| Orchid Dottyback Pseudochromis fridmani | Marine | 6.3 | 80 | Semi-aggressive | Suits a first tank | |
| Pajama Cardinalfish Sphaeramia nematoptera | Marine | 7.5 | 120 | Peaceful | Suits a first tank | |
| Paradise Fish Macropodus opercularis | Freshwater | 7.5 | 80 | Aggressive | Suits a first tank | |
| Pea Puffer Carinotetraodon travancoricus | Freshwater | 3 | 40 | Aggressive | Some experience helps | |
| Penguin Tetra Thayeria boehlkei | Freshwater | 4 | 70 | Peaceful | Suits a first tank | |
| Pictus Catfish Pimelodus pictus | Freshwater | 11 | 200 | Semi-aggressive | Some experience helps | |
| Powder Blue Tang Acanthurus leucosternon | Marine | 25 | 500 | Aggressive | Experienced keepers only | |
| Purple Firefish Nemateleotris decora | Marine | 8 | 75 | Peaceful | Some experience helps | |
| Purple Tang Zebrasoma xanthurum | Marine | 20 | 400 | Aggressive | Some experience helps | |
| Red Phantom Tetra Megalamphodus sweglesi | Freshwater | 3.2 | 60 | Peaceful | Some experience helps | |
| Red Zebra Maylandia estherae | Freshwater | 11 | 200 | Aggressive | Some experience helps | |
| Reticulated Hillstream Loach Sewellia lineolata | Freshwater | 6 | 75 | Peaceful | Some experience helps | |
| Rosy Tetra Megalamphodus rosaceus | Freshwater | 3.4 | 60 | Peaceful | Suits a first tank | |
| Sailfin Tang Zebrasoma velifer | Marine | 35 | 700 | Semi-aggressive | Some experience helps | |
| Salt and Pepper Cory Corydoras habrosus | Freshwater | 2.5 | 45 | Peaceful | Suits a first tank | |
| Scarlet Badis Dario dario | Freshwater | 2 | 30 | Peaceful | Some experience helps | |
| Scissortail Rasbora Rasbora trilineata | Freshwater | 10 | 120 | Peaceful | Suits a first tank | |
| Serpae Tetra Megalamphodus eques | Freshwater | 4 | 70 | Semi-aggressive | Suits a first tank | |
| Severum Heros efasciatus | Freshwater | 20 | 250 | Semi-aggressive | Suits a first tank | |
| Siamese Algae Eater Crossocheilus oblongus | Freshwater | 15 | 150 | Peaceful | Suits a first tank | |
| Silver Dollar Metynnis argenteus | Freshwater | 14 | 300 | Peaceful | Suits a first tank | |
| Silvertip Tetra Hasemania nana | Freshwater | 3.8 | 70 | Semi-aggressive | Suits a first tank | |
| Snowflake Moray Eel Echidna nebulosa | Marine | 60 | 300 | Predator | Some experience helps | |
| Spotted Blue-Eye Pseudomugil gertrudae | Freshwater | 3.5 | 45 | Peaceful | Some experience helps | |
| Spotted Mandarin Synchiropus picturatus | Marine | 7 | 120 | Peaceful | Experienced keepers only | |
| Striped Raphael Catfish Platydoras costatus | Freshwater | 20 | 200 | Peaceful | Suits a first tank | |
| Tailspot Blenny Ecsenius stigmatura | Marine | 5.5 | 55 | Peaceful | Suits a first tank | |
| Three Stripe Damselfish Dascyllus aruanus | Marine | 8 | 120 | Aggressive | Suits a first tank | |
| Tinfoil Barb Barbonymus schwanefeldii | Freshwater | 30 | 600 | Peaceful | Some experience helps | |
| Tomato Clownfish Amphiprion frenatus | Marine | 12 | 120 | Semi-aggressive | Suits a first tank | |
| Upside-Down Catfish Synodontis nigriventris | Freshwater | 9.5 | 80 | Peaceful | Suits a first tank | |
| Yellow Clown Goby Gobiodon okinawae | Marine | 3.5 | 40 | Peaceful | Suits a first tank | |
| Yellow Coris Wrasse Halichoeres chrysus | Marine | 11 | 180 | Peaceful | Suits a first tank | |
| Yellow Watchman Goby Cryptocentrus cinctus | Marine | 9 | 75 | Peaceful | Suits a first tank | |
| Yoyo Loach Botia lohachata | Freshwater | 14 | 200 | Semi-aggressive | Suits a first tank | |
| Yucatan Sailfin Molly Poecilia velifera | Brackish | 15 | 150 | Peaceful | Some experience helps | |
| Zebra Mbuna Maylandia zebra | Freshwater | 11 | 200 | Aggressive | Suits a first tank | |
| Adolfo's Cory Corydoras adolfoi | Freshwater | 5.5 | 80 | Peaceful | Suits a first tank | |
| African Flameback Angelfish Centropyge acanthops | Marine | 8 | 120 | Semi-aggressive | Some experience helps | |
| Amazon Puffer Colomesus asellus | Freshwater | 8 | 120 | Peaceful | Some experience helps | |
| Antennata Lionfish Pterois antennata | Marine | 18 | 250 | Predator | Some experience helps | |
| Asian Bumblebee Catfish Pseudomystus siamensis | Freshwater | 14 | 150 | Predator | Some experience helps | |
| Atlantic Blue Tang Acanthurus coeruleus | Marine | 25 | 450 | Semi-aggressive | Some experience helps | |
| Azure Damselfish Chrysiptera hemicyanea | Marine | 7 | 120 | Semi-aggressive | Suits a first tank | |
| Banded Rainbowfish Melanotaenia trifasciata | Freshwater | 12 | 180 | Peaceful | Suits a first tank | |
| Banded Severum Heros severus | Freshwater | 18 | 250 | Peaceful | Suits a first tank | |
| Benga Peacock Cichlid Aulonocara baenschi | Freshwater | 12 | 250 | Semi-aggressive | Some experience helps | |
| Black Ghost Knifefish Apteronotus albifrons | Freshwater | 35 | 400 | Peaceful | Some experience helps | |
| Blue Chromis Azurina cyanea | Marine | 12 | 150 | Peaceful | Suits a first tank | |
| Blue Dolphin Cichlid Cyrtocara moorii | Freshwater | 20 | 350 | Peaceful | Some experience helps | |
| Blueface Angelfish Pomacanthus xanthometopon | Marine | 30 | 600 | Semi-aggressive | Some experience helps | |
| Blunthead Cichlid Tropheus moorii | Freshwater | 13 | 300 | Aggressive | Experienced keepers only | |
| Borelli's Dwarf Cichlid Apistogramma borellii | Freshwater | 6.5 | 60 | Peaceful | Suits a first tank | |
| Brilliant Rasbora Rasbora borapetensis | Freshwater | 5 | 60 | Peaceful | Suits a first tank | |
| Bristletail Filefish Acreichthys tomentosus | Marine | 11 | 150 | Peaceful | Suits a first tank | |
| Bushynose Pleco Ancistrus dolichopterus | Freshwater | 12 | 100 | Peaceful | Suits a first tank | |
| Calvus Cichlid Altolamprologus calvus | Freshwater | 13.5 | 200 | Semi-aggressive | Some experience helps | |
| Carpenter's Flasher Wrasse Paracheilinus carpenteri | Marine | 8 | 150 | Peaceful | Some experience helps | |
| Checker Barb Oliotius oligolepis | Freshwater | 4.5 | 60 | Peaceful | Suits a first tank | |
| Cherubfish Centropyge argi | Marine | 7 | 120 | Semi-aggressive | Suits a first tank | |
| Citron Clown Goby Gobiodon citrinus | Marine | 5.5 | 60 | Peaceful | Some experience helps | |
| Convict Julie Julidochromis regani | Freshwater | 13 | 180 | Semi-aggressive | Some experience helps | |
| Convict Tang Acanthurus triostegus | Marine | 18 | 350 | Peaceful | Some experience helps | |
| Daffodil Cichlid Neolamprologus pulcher | Freshwater | 7 | 100 | Aggressive | Suits a first tank | |
| Diamond Tetra Makunaima pittieri | Freshwater | 6 | 80 | Peaceful | Suits a first tank | |
| Doctor Fish Garra rufa | Freshwater | 12 | 150 | Peaceful | Suits a first tank | |
| Dwarf Chain Loach Ambastaia sidthimunki | Freshwater | 5.5 | 80 | Peaceful | Some experience helps | |
| Dwarf Corydoras Corydoras hastatus | Freshwater | 2.5 | 45 | Peaceful | Some experience helps | |
| Dwarf Pencilfish Nannostomus marginatus | Freshwater | 3.5 | 45 | Peaceful | Some experience helps | |
| Dwarf Rasbora Boraras maculatus | Freshwater | 2.5 | 30 | Peaceful | Some experience helps | |
| Featherfin Squeaker Synodontis eupterus | Freshwater | 20 | 200 | Semi-aggressive | Suits a first tank | |
| Figure Eight Puffer Dichotomyctere ocellatus | Brackish | 8 | 80 | Semi-aggressive | Some experience helps | |
| Fire Eel Mastacembelus erythrotaenia | Freshwater | 60 | 500 | Peaceful | Some experience helps | |
| Fiveband Barb Desmopuntius pentazona | Freshwater | 5 | 70 | Peaceful | Suits a first tank | |
| Flame Hawkfish Neocirrhites armatus | Marine | 9 | 120 | Semi-aggressive | Suits a first tank | |
| Flavescent Peacock Aulonocara stuartgranti | Freshwater | 12 | 250 | Semi-aggressive | Some experience helps | |
| Frontosa Cyphotilapia frontosa | Freshwater | 30 | 600 | Semi-aggressive | Some experience helps | |
| Gardner's Killi Fundulopanchax gardneri | Freshwater | 6.5 | 50 | Semi-aggressive | Suits a first tank | |
| Giant Danio Devario aequipinnatus | Freshwater | 12 | 180 | Peaceful | Suits a first tank | |
| Golden Head Sleeper Goby Valenciennea strigata | Marine | 16 | 200 | Peaceful | Some experience helps | |
| Golden Julie Julidochromis ornatus | Freshwater | 8.5 | 80 | Semi-aggressive | Some experience helps | |
| Golden Wonder Killifish Aplocheilus lineatus | Freshwater | 8.5 | 80 | Semi-aggressive | Suits a first tank | |
| Green Clown Goby Gobiodon histrio | Marine | 3.5 | 40 | Peaceful | Some experience helps | |
| Green Neon Tetra Paracheirodon simulans | Freshwater | 2.5 | 45 | Peaceful | Some experience helps | |
| Green Spotted Puffer Dichotomyctere nigroviridis | Brackish | 15 | 150 | Aggressive | Some experience helps | |
| Harlequin Tuskfish Choerodon fasciatus | Marine | 25 | 450 | Semi-aggressive | Some experience helps | |
| Head-and-Taillight Tetra Holopristis ocellifera | Freshwater | 4.5 | 60 | Peaceful | Suits a first tank | |
| Heckel Discus Symphysodon discus | Freshwater | 15 | 300 | Peaceful | Experienced keepers only | |
| Hengel's Rasbora Trigonostigma hengeli | Freshwater | 3 | 50 | Peaceful | Suits a first tank | |
| Ice Blue Cichlid Maylandia greshakei | Freshwater | 13 | 250 | Aggressive | Suits a first tank | |
| Indian Glassy Fish Parambassis ranga | Brackish | 7 | 80 | Peaceful | Some experience helps | |
| Jewel Cichlid Rubricatochromis guttatus | Freshwater | 12 | 120 | Aggressive | Suits a first tank | |
| Johanni Mbuna Pseudotropheus johannii | Freshwater | 10 | 200 | Aggressive | Some experience helps | |
| Koran Angelfish Pomacanthus semicirculatus | Marine | 32 | 650 | Semi-aggressive | Some experience helps | |
| Least Rasbora Boraras urophthalmoides | Freshwater | 2.5 | 30 | Peaceful | Some experience helps | |
| Lemon Damselfish Pomacentrus moluccensis | Marine | 9 | 150 | Aggressive | Suits a first tank | |
| Lemonpeel Angelfish Centropyge flavissima | Marine | 12 | 200 | Semi-aggressive | Some experience helps | |
| Leopard Bushfish Ctenopoma acutirostre | Freshwater | 15 | 200 | Predator | Some experience helps | |
| Lined Seahorse Hippocampus erectus | Marine | 15 | 150 | Peaceful | Experienced keepers only | |
| Longfin Bannerfish Heniochus acuminatus | Marine | 20 | 350 | Peaceful | Some experience helps | |
| Longnose Hawkfish Oxycirrhites typus | Marine | 12 | 150 | Semi-aggressive | Suits a first tank | |
| Longspine Porcupinefish Diodon holocanthus | Marine | 30 | 600 | Predator | Some experience helps | |
| Lyretail Killifish Aphyosemion australe | Freshwater | 6 | 45 | Peaceful | Suits a first tank | |
| Magenta Dottyback Pictichromis porphyrea | Marine | 6 | 100 | Aggressive | Suits a first tank | |
| Majestic Angelfish Pomacanthus navarchus | Marine | 25 | 500 | Semi-aggressive | Some experience helps | |
| Marbled Hatchetfish Carnegiella strigata | Freshwater | 3.5 | 60 | Peaceful | Some experience helps | |
| Marlier's Julie Julidochromis marlieri | Freshwater | 12 | 150 | Semi-aggressive | Some experience helps | |
| Masked Julie Julidochromis transcriptus | Freshwater | 7 | 75 | Semi-aggressive | Some experience helps | |
| McCosker's Flasher Wrasse Paracheilinus mccoskeri | Marine | 7.5 | 120 | Peaceful | Some experience helps | |
| Mexican Tetra Astyanax mexicanus | Freshwater | 9 | 100 | Semi-aggressive | Suits a first tank | |
| Midas Cichlid Amphilophus citrinellus | Freshwater | 25 | 300 | Aggressive | Some experience helps | |
| Moorish Idol Zanclus cornutus | Marine | 20 | 500 | Peaceful | Experienced keepers only | |
| Multies Neolamprologus multifasciatus | Freshwater | 4 | 60 | Semi-aggressive | Suits a first tank | |
| Naso Tang Naso lituratus | Marine | 35 | 700 | Peaceful | Some experience helps | |
| Niger Triggerfish Odonus niger | Marine | 30 | 500 | Semi-aggressive | Suits a first tank | |
| One-Spot Foxface Siganus unimaculatus | Marine | 18 | 300 | Peaceful | Suits a first tank | |
| Ornate Tetra Megalamphodus bentosi | Freshwater | 4.5 | 60 | Peaceful | Suits a first tank | |
| Panda Garra Garra flavatra | Freshwater | 6 | 80 | Peaceful | Suits a first tank | |
| Peacock Eel Macrognathus siamensis | Freshwater | 25 | 180 | Peaceful | Some experience helps | |
| Peacock Gudgeon Tateurndina ocellicauda | Freshwater | 6.5 | 55 | Peaceful | Some experience helps | |
| Pearl Cichlid Geophagus brasiliensis | Freshwater | 22 | 300 | Semi-aggressive | Suits a first tank | |
| Pearl Danio Danio albolineatus | Freshwater | 5.5 | 75 | Peaceful | Suits a first tank | |
| Peters' Elephantnose Fish Gnathonemus petersii | Freshwater | 23 | 250 | Peaceful | Experienced keepers only | |
| Picasso Triggerfish Rhinecanthus aculeatus | Marine | 25 | 400 | Aggressive | Suits a first tank | |
| Pindani Chindongo socolofi | Freshwater | 8.5 | 200 | Semi-aggressive | Suits a first tank | |
| Pink Skunk Clownfish Amphiprion perideraion | Marine | 10 | 100 | Semi-aggressive | Suits a first tank | |
| Pygmy Synodontis Synodontis petricola | Freshwater | 10 | 150 | Peaceful | Suits a first tank | |
| Raccoon Butterflyfish Chaetodon lunula | Marine | 18 | 300 | Peaceful | Some experience helps | |
| Randall's Shrimp Goby Amblyeleotris randalli | Marine | 9 | 60 | Peaceful | Suits a first tank | |
| Red Devil Cichlid Amphilophus labiatus | Freshwater | 28 | 300 | Aggressive | Some experience helps | |
| Red Empress Protomelas taeniolatus | Freshwater | 15 | 300 | Semi-aggressive | Suits a first tank | |
| Red Neon Blue-Eye Pseudomugil paskai | Freshwater | 3 | 45 | Peaceful | Some experience helps | |
| Red Rainbowfish Glossolepis incisa | Freshwater | 12 | 200 | Peaceful | Suits a first tank | |
| Red-Bellied Piranha Pygocentrus nattereri | Freshwater | 28 | 350 | Predator | Some experience helps | |
| Redhump Eartheater Geophagus steindachneri | Freshwater | 15 | 250 | Peaceful | Some experience helps | |
| Reedfish Erpetoichthys calabaricus | Freshwater | 35 | 200 | Peaceful | Some experience helps | |
| Royal Dottyback Pictichromis paccagnellorum | Marine | 7 | 120 | Aggressive | Suits a first tank | |
| Royal Tetra Inpaichthys kerri | Freshwater | 3.5 | 60 | Peaceful | Suits a first tank | |
| Rusty Cichlid Iodotropheus sprengerae | Freshwater | 10 | 200 | Semi-aggressive | Suits a first tank | |
| Schooling Bannerfish Heniochus diphreutes | Marine | 18 | 350 | Peaceful | Some experience helps | |
| Scopas Tang Zebrasoma scopas | Marine | 20 | 350 | Semi-aggressive | Suits a first tank | |
| Sebae Clownfish Amphiprion sebae | Marine | 14 | 150 | Semi-aggressive | Some experience helps | |
| Silver Hatchetfish Gasteropelecus sternicla | Freshwater | 5.5 | 80 | Peaceful | Some experience helps | |
| Silver Moony Monodactylus argenteus | Brackish | 20 | 400 | Peaceful | Some experience helps | |
| Sixspot Sleeper Goby Valenciennea sexguttata | Marine | 13 | 150 | Peaceful | Some experience helps | |
| Sparkling Gourami Trichopsis pumila | Freshwater | 3.5 | 40 | Peaceful | Suits a first tank | |
| Spotted Raphael Catfish Agamyxis pectinifrons | Freshwater | 14 | 150 | Peaceful | Suits a first tank | |
| Spotted Scat Scatophagus argus | Brackish | 25 | 400 | Peaceful | Some experience helps | |
| Threadfin Butterflyfish Chaetodon auriga | Marine | 20 | 350 | Peaceful | Some experience helps | |
| Threadfin Rainbowfish Iriatherina werneri | Freshwater | 4 | 60 | Peaceful | Some experience helps | |
| Valentini Puffer Canthigaster valentini | Marine | 10 | 120 | Semi-aggressive | Some experience helps | |
| Venustus Cichlid Nimbochromis venustus | Freshwater | 22 | 450 | Predator | Some experience helps | |
| Wheeler's Shrimp Goby Amblyeleotris wheeleri | Marine | 8 | 80 | Peaceful | Suits a first tank | |
| White-Spotted Cichlid Tropheus duboisi | Freshwater | 12 | 300 | Aggressive | Experienced keepers only | |
| Yellow Blaze Lithobates Otopharynx lithobates | Freshwater | 14 | 250 | Semi-aggressive | Some experience helps | |
| Yellow Seahorse Hippocampus kuda | Marine | 20 | 120 | Peaceful | Experienced keepers only | |
| Yellowhead Jawfish Opistognathus aurifrons | Marine | 10 | 120 | Peaceful | Some experience helps | |
| Zebra Loach Botia striata | Freshwater | 7.8 | 110 | Peaceful | Some experience helps | |
| Zebra Moray Gymnomuraena zebra | Marine | 100 | 450 | Peaceful | Suits a first tank | |
| Zebra Pleco Hypancistrus zebra | Freshwater | 7 | 80 | Peaceful | Some experience helps | |
| Achilles Tang Acanthurus achilles | Marine | 22 | 600 | Aggressive | Experienced keepers only | |
| African Butterflyfish Pantodon buchholzi | Freshwater | 11.5 | 120 | Semi-aggressive | Some experience helps | |
| African Knifefish Xenomystus nigri | Freshwater | 20 | 200 | Peaceful | Some experience helps | |
| African Moony Monodactylus sebae | Brackish | 20 | 450 | Peaceful | Some experience helps | |
| American Flagfish Jordanella floridae | Freshwater | 6 | 60 | Semi-aggressive | Suits a first tank | |
| Arc-eye Hawkfish Paracirrhites arcatus | Marine | 14 | 200 | Semi-aggressive | Suits a first tank | |
| Badis Badis badis | Freshwater | 6.5 | 60 | Peaceful | Some experience helps | |
| Banded Archerfish Toxotes jaculatrix | Brackish | 20 | 300 | Peaceful | Some experience helps | |
| Banded Leporinus Leporinus fasciatus | Freshwater | 25 | 300 | Semi-aggressive | Some experience helps | |
| Banded Sleeper Goby Amblygobius phalaena | Marine | 14 | 200 | Peaceful | Suits a first tank | |
| Banjo Catfish Bunocephalus coracoideus | Freshwater | 11 | 80 | Peaceful | Suits a first tank | |
| Barred Bichir Polypterus delhezi | Freshwater | 35 | 300 | Semi-aggressive | Some experience helps | |
| Bicolor Anthias Nemanthias bicolor | Marine | 12 | 300 | Peaceful | Some experience helps | |
| Bicolor Chromis Pycnochromis margaritifer | Marine | 9 | 150 | Peaceful | Suits a first tank | |
| Bird Wrasse Gomphosus varius | Marine | 25 | 450 | Semi-aggressive | Some experience helps | |
| Bitaeniata Dwarf Cichlid Apistogramma bitaeniata | Freshwater | 6.5 | 60 | Peaceful | Some experience helps | |
| Black Diamond Stingray Potamotrygon leopoldi | Freshwater | 60 | 1200 | Semi-aggressive | Experienced keepers only | |
| Blackcap Basslet Gramma melacara | Marine | 9 | 120 | Semi-aggressive | Some experience helps | |
| Blind Cave Tetra Astyanax jordani | Freshwater | 9 | 100 | Peaceful | Suits a first tank | |
| Blue Botia Yasuhikotakia modesta | Freshwater | 18 | 250 | Semi-aggressive | Some experience helps | |
| Blue Peacock Cichlid Aulonocara nyassae | Freshwater | 9 | 200 | Semi-aggressive | Some experience helps | |
| Blue Star Leopard Wrasse Macropharyngodon bipartitus | Marine | 12 | 250 | Peaceful | Experienced keepers only | |
| Bluejaw Triggerfish Xanthichthys auromarginatus | Marine | 22 | 350 | Peaceful | Some experience helps | |
| Bluestripe Pipefish Doryrhamphus excisus | Marine | 7 | 80 | Peaceful | Experienced keepers only | |
| Brevis Shell Dweller Neolamprologus brevis | Freshwater | 5.5 | 60 | Semi-aggressive | Some experience helps | |
| Brown Pencilfish Nannostomus eques | Freshwater | 4.5 | 50 | Peaceful | Suits a first tank | |
| Bucktooth Tetra Exodon paradoxus | Freshwater | 7.5 | 200 | Aggressive | Some experience helps | |
| Bumblebee Cichlid Pseudotropheus crabro | Freshwater | 13 | 250 | Aggressive | Some experience helps | |
| Candy Striped Pleco Peckoltia vittata | Freshwater | 11 | 100 | Peaceful | Suits a first tank | |
| Celebes Rainbowfish Marosatherina ladigesi | Freshwater | 7 | 100 | Peaceful | Suits a first tank | |
| Chalk Bass Serranus tortugarum | Marine | 8 | 120 | Peaceful | Suits a first tank | |
| Checkerboard Cichlid Dicrossus filamentosus | Freshwater | 6 | 70 | Peaceful | Experienced keepers only | |
| Chocolate Cichlid Hypselecara temporalis | Freshwater | 22 | 300 | Peaceful | Some experience helps | |
| Chocolate Gourami Sphaerichthys osphromenoides | Freshwater | 5 | 60 | Peaceful | Experienced keepers only | |
| Chocolate Whiptail Catfish Rineloricaria lanceolata | Freshwater | 12 | 90 | Peaceful | Suits a first tank | |
| Cinnamon Clownfish Amphiprion melanopus | Marine | 11 | 150 | Aggressive | Suits a first tank | |
| Clearfin Lionfish Pterois radiata | Marine | 20 | 300 | Predator | Some experience helps | |
| Clown Knifefish Chitala ornata | Freshwater | 60 | 800 | Predator | Some experience helps | |
| Clown Tang Acanthurus lineatus | Marine | 26 | 600 | Aggressive | Experienced keepers only | |
| Clown Triggerfish Balistoides conspicillum | Marine | 35 | 900 | Aggressive | Some experience helps | |
| Cochu's Blue Tetra Boehlkea fredcochui | Freshwater | 4.5 | 70 | Semi-aggressive | Suits a first tank | |
| Columbian Shark Ariopsis seemanni | Brackish | 30 | 400 | Peaceful | Some experience helps | |
| Common Rummy-Nose Tetra Petitella rhodostoma | Freshwater | 4.5 | 80 | Peaceful | Some experience helps | |
| Croaking Gourami Trichopsis vittata | Freshwater | 6.5 | 60 | Peaceful | Suits a first tank | |
| Cylinder Cichlid Neolamprologus cylindricus | Freshwater | 11 | 150 | Aggressive | Some experience helps | |
| Deep Water Hap Placidochromis electra | Freshwater | 12 | 300 | Peaceful | Some experience helps | |
| Demon Eartheater Satanoperca jurupari | Freshwater | 20 | 350 | Peaceful | Some experience helps | |
| Diadem Dottyback Pictichromis diadema | Marine | 6.2 | 80 | Aggressive | Suits a first tank | |
| Dickfeld's Julie Julidochromis dickfeldi | Freshwater | 10 | 100 | Semi-aggressive | Some experience helps | |
| Disco Blenny Meiacanthus smithi | Marine | 8.5 | 120 | Peaceful | Suits a first tank | |
| Dispar Anthias Nemanthias dispar | Marine | 9.5 | 250 | Peaceful | Experienced keepers only | |
| Dogtooth Cichlid Cynotilapia afra | Freshwater | 10 | 200 | Aggressive | Some experience helps | |
| Dragon Wrasse Novaculichthys taeniourus | Marine | 25 | 400 | Semi-aggressive | Some experience helps | |
| Eastern Rainbowfish Melanotaenia splendida | Freshwater | 12 | 200 | Peaceful | Suits a first tank | |
| Eibl's Angelfish Centropyge eibli | Marine | 11 | 250 | Semi-aggressive | Some experience helps | |
| Engineer Goby Pholidichthys leucotaenia | Marine | 30 | 250 | Peaceful | Suits a first tank | |
| Exquisite Fairy Wrasse Cirrhilabrus exquisitus | Marine | 11 | 200 | Peaceful | Some experience helps | |
| Falco Hawkfish Cirrhitichthys falco | Marine | 7 | 120 | Semi-aggressive | Suits a first tank | |
| Fathead Minnow Pimephales promelas | Freshwater | 8 | 75 | Peaceful | Suits a first tank | |
| Filament Barb Dawkinsia filamentosa | Freshwater | 13 | 250 | Peaceful | Suits a first tank | |
| Filamented Flasher Wrasse Paracheilinus filamentosus | Marine | 9 | 150 | Peaceful | Suits a first tank | |
| Five-Bar Cichlid Neolamprologus tretocephalus | Freshwater | 15 | 250 | Aggressive | Some experience helps | |
| Flag Acara Laetacara curviceps | Freshwater | 6.5 | 80 | Peaceful | Suits a first tank | |
| Flag Cichlid Mesonauta festivus | Freshwater | 12 | 180 | Peaceful | Some experience helps | |
| Forktail Blenny Meiacanthus atrodorsalis | Marine | 10 | 120 | Peaceful | Suits a first tank | |
| Freckled Hawkfish Paracirrhites forsteri | Marine | 18 | 300 | Aggressive | Suits a first tank | |
| Fuelleborn's Cichlid Labeotropheus fuelleborni | Freshwater | 18 | 300 | Aggressive | Suits a first tank | |
| Fuzzy Dwarf Lionfish Dendrochirus brachypterus | Marine | 15 | 200 | Predator | Some experience helps | |
| Glass Bloodfin Tetra Prionobrama filigera | Freshwater | 5.5 | 70 | Peaceful | Suits a first tank | |
| Glass Catfish Kryptopterus bicirrhis | Freshwater | 12 | 120 | Peaceful | Some experience helps | |
| Golden Butterflyfish Chaetodon semilarvatus | Marine | 20 | 450 | Peaceful | Some experience helps | |
| Golden Dwarf Cichlid Nannacara anomala | Freshwater | 6 | 70 | Peaceful | Suits a first tank | |
| Golden Orfe Leuciscus idus | Freshwater | 45 | 1500 | Peaceful | Some experience helps | |
| Goldrim Tang Acanthurus nigricans | Marine | 20 | 350 | Semi-aggressive | Experienced keepers only | |
| Green Glass Knifefish Eigenmannia virescens | Freshwater | 25 | 250 | Peaceful | Some experience helps | |
| Guenther's Killifish Nothobranchius guentheri | Freshwater | 4.5 | 40 | Peaceful | Some experience helps | |
| Harlequin Filefish Oxymonacanthus longirostris | Marine | 10 | 150 | Peaceful | Experienced keepers only | |
| Herald's Angelfish Centropyge heraldi | Marine | 11 | 250 | Semi-aggressive | Some experience helps | |
| Hi Fin Red Banded Goby Stonogobiops nematodes | Marine | 5 | 40 | Peaceful | Suits a first tank | |
| Horseface Loach Acantopsis dialuzona | Freshwater | 18 | 200 | Peaceful | Some experience helps | |
| Humuhumu Triggerfish Rhinecanthus rectangulus | Marine | 22 | 350 | Aggressive | Suits a first tank | |
| Indonesian Tiger Datnoid Datnioides microlepis | Freshwater | 40 | 600 | Predator | Some experience helps | |
| Jaguar Cichlid Parachromis managuensis | Freshwater | 40 | 500 | Aggressive | Some experience helps | |
| Jardini Arowana Scleropages jardinii | Freshwater | 60 | 800 | Aggressive | Some experience helps | |
| Keyhole Cichlid Cleithracara maronii | Freshwater | 10 | 100 | Peaceful | Suits a first tank | |
| Klein's Butterflyfish Chaetodon kleinii | Marine | 14 | 300 | Peaceful | Suits a first tank | |
| Kole Yellow Eye Tang Ctenochaetus strigosus | Marine | 15 | 300 | Semi-aggressive | Some experience helps | |
| Lake Tebera Rainbowfish Melanotaenia herbertaxelrodi | Freshwater | 9 | 150 | Peaceful | Suits a first tank | |
| Lamarck's Angelfish Genicanthus lamarck | Marine | 22 | 450 | Peaceful | Some experience helps | |
| Leopard Wrasse Macropharyngodon meleagris | Marine | 12 | 250 | Peaceful | Experienced keepers only | |
| Lima Shovelnose Catfish Sorubim lima | Freshwater | 40 | 450 | Predator | Some experience helps | |
| Lionhead Cichlid Steatocranus casuarius | Freshwater | 10 | 120 | Peaceful | Suits a first tank | |
| Livingstoni Cichlid Nimbochromis livingstonii | Freshwater | 22 | 500 | Predator | Some experience helps | |
| Longfin African Tetra Bryconalestes longipinnis | Freshwater | 12 | 200 | Peaceful | Suits a first tank | |
| Longhorn Cowfish Lactoria cornuta | Marine | 35 | 700 | Peaceful | Experienced keepers only | |
| Longnose Butterflyfish Forcipiger flavissimus | Marine | 20 | 350 | Peaceful | Some experience helps | |
| Lubbock's Fairy Wrasse Cirrhilabrus lubbocki | Marine | 7.5 | 150 | Peaceful | Suits a first tank | |
| Lunar Wrasse Thalassoma lunare | Marine | 25 | 500 | Aggressive | Suits a first tank | |
| Macmaster's Dwarf Cichlid Apistogramma macmasteri | Freshwater | 6.5 | 70 | Peaceful | Some experience helps | |
| Madagascar Rainbowfish Bedotia geayi | Freshwater | 9 | 150 | Peaceful | Some experience helps | |
| Malabar Danio Devario malabaricus | Freshwater | 10 | 150 | Peaceful | Suits a first tank | |
| Malawi Eyebiter Dimidiochromis compressiceps | Freshwater | 23 | 450 | Predator | Some experience helps | |
| Mimic Tang Acanthurus pyroferus | Marine | 20 | 350 | Semi-aggressive | Some experience helps | |
| Mosquitofish Gambusia affinis | Freshwater | 5 | 50 | Semi-aggressive | Suits a first tank | |
| Motoro Stingray Potamotrygon motoro | Freshwater | 50 | 900 | Semi-aggressive | Experienced keepers only | |
| Neon Damselfish Pomacentrus coelestis | Marine | 9 | 150 | Aggressive | Suits a first tank | |
| Neon Dottyback Pseudochromis aldabraensis | Marine | 9 | 120 | Aggressive | Suits a first tank | |
| Nicaragua Cichlid Hypsophrys nicaraguensis | Freshwater | 18 | 250 | Semi-aggressive | Some experience helps | |
| Ocellatus Shell Dweller Lamprologus ocellatus | Freshwater | 5 | 60 | Semi-aggressive | Some experience helps | |
| Orange Chromide Pseudetroplus maculatus | Brackish | 8 | 120 | Peaceful | Some experience helps | |
| Orange Skunk Clownfish Amphiprion akallopisos | Marine | 10 | 120 | Peaceful | Suits a first tank | |
| Orange Skunk Clownfish Amphiprion sandaracinos | Marine | 11 | 120 | Semi-aggressive | Suits a first tank | |
| Orinoco Sailfin Pleco Pterygoplichthys multiradiatus | Freshwater | 45 | 500 | Peaceful | Suits a first tank | |
| Ornate Bichir Polypterus ornatipinnis | Freshwater | 50 | 600 | Semi-aggressive | Some experience helps | |
| Parkinson's Rainbowfish Melanotaenia parkinsoni | Freshwater | 11 | 200 | Peaceful | Suits a first tank | |
| Peaceful Betta Betta imbellis | Freshwater | 5.5 | 40 | Peaceful | Suits a first tank | |
| Pinkbar Goby Amblyeleotris aurora | Marine | 10 | 120 | Peaceful | Some experience helps | |
| Pinktail Triggerfish Melichthys vidua | Marine | 28 | 450 | Semi-aggressive | Suits a first tank | |
| Plain Silver Dollar Metynnis hypsauchen | Freshwater | 15 | 300 | Peaceful | Suits a first tank | |
| Pyramid Butterflyfish Hemitaurichthys polylepis | Marine | 18 | 450 | Peaceful | Some experience helps | |
| Queen Angelfish Holacanthus ciliaris | Marine | 35 | 750 | Semi-aggressive | Experienced keepers only | |
| Rachow's Notho Nothobranchius rachovii | Freshwater | 5 | 40 | Peaceful | Some experience helps | |
| Radiant Wrasse Halichoeres iridis | Marine | 11.5 | 250 | Peaceful | Some experience helps | |
| Rainbow Cichlid Herotilapia multispinosa | Freshwater | 12 | 150 | Peaceful | Suits a first tank | |
| Red Fin Caudopunctatus Neolamprologus caudopunctatus | Freshwater | 6.5 | 80 | Peaceful | Some experience helps | |
| Red Flush Peacock Cichlid Aulonocara hansbaenschi | Freshwater | 11 | 200 | Semi-aggressive | Some experience helps | |
| Red Shiner Cyprinella lutrensis | Freshwater | 8 | 100 | Peaceful | Suits a first tank | |
| Red Terror Cichlid Mesoheros festae | Freshwater | 30 | 450 | Aggressive | Some experience helps | |
| Red Top Mbuna Labeotropheus trewavasae | Freshwater | 11.5 | 240 | Aggressive | Some experience helps | |
| Red-striped Eartheater Geophagus surinamensis | Freshwater | 20 | 350 | Peaceful | Some experience helps | |
| Redbreast Acara Laetacara dorsigera | Freshwater | 6 | 80 | Peaceful | Suits a first tank | |
| Redchin Panchax Epiplatys dageti | Freshwater | 5.5 | 50 | Peaceful | Suits a first tank | |
| Redfin Hemiodus Hemiodus gracilis | Freshwater | 15 | 300 | Peaceful | Some experience helps | |
| Redfin Kadango Copadichromis borleyi | Freshwater | 14 | 350 | Semi-aggressive | Suits a first tank | |
| Redhook Myleus Myloplus rubripinnis | Freshwater | 25 | 500 | Peaceful | Suits a first tank | |
| Regal Angelfish Pygoplites diacanthus | Marine | 20 | 500 | Peaceful | Experienced keepers only | |
| Rock Beauty Angelfish Holacanthus tricolor | Marine | 22 | 450 | Semi-aggressive | Experienced keepers only | |
| Royal Pleco Panaque nigrolineatus | Freshwater | 30 | 450 | Peaceful | Some experience helps | |
| Ruby Dragonet Synchiropus sycorax | Marine | 4.5 | 100 | Peaceful | Experienced keepers only | |
| Rusty Angelfish Centropyge ferrugata | Marine | 10 | 200 | Semi-aggressive | Some experience helps | |
| Saddleback Clownfish Amphiprion polymnus | Marine | 12 | 180 | Semi-aggressive | Suits a first tank | |
| Salvini Cichlid Trichromis salvini | Freshwater | 18 | 250 | Aggressive | Some experience helps | |
| Scissortail Dartfish Ptereleotris evides | Marine | 12 | 150 | Peaceful | Some experience helps | |
| Silver-Belly Wrasse Halichoeres leucoxanthus | Marine | 11 | 200 | Peaceful | Suits a first tank | |
| Six-Banded Barb Desmopuntius hexazona | Freshwater | 5 | 80 | Peaceful | Suits a first tank | |
| Skunk Cory Corydoras arcuatus | Freshwater | 5 | 70 | Peaceful | Suits a first tank | |
| Sohal Tang Acanthurus sohal | Marine | 30 | 700 | Aggressive | Some experience helps | |
| Spotted Hillstream Loach Gastromyzon punctulatus | Freshwater | 6.5 | 80 | Peaceful | Some experience helps | |
| Spotted Prawn Goby Amblyeleotris guttata | Marine | 9 | 120 | Peaceful | Suits a first tank | |
| Spotted Raphael Catfish Agamyxis albomaculatus | Freshwater | 15 | 150 | Peaceful | Suits a first tank | |
| Starry Dragonet Synchiropus stellatus | Marine | 7.5 | 120 | Peaceful | Experienced keepers only | |
| Starry Night Cichlid Paratilapia polleni | Freshwater | 25 | 450 | Semi-aggressive | Some experience helps | |
| Stars and Stripes Puffer Arothron hispidus | Marine | 40 | 700 | Semi-aggressive | Some experience helps | |
| Steinitz' Shrimp Goby Amblyeleotris steinitzi | Marine | 9 | 120 | Peaceful | Suits a first tank | |
| Striped Fangblenny Meiacanthus grammistes | Marine | 10 | 120 | Peaceful | Suits a first tank | |
| Striped Headstander Anostomus anostomus | Freshwater | 15 | 250 | Semi-aggressive | Some experience helps | |
| Striped Kribensis Pelvicachromis taeniatus | Freshwater | 7.1 | 80 | Semi-aggressive | Some experience helps | |
| Sulfurhead Peacock Cichlid Aulonocara maylandi | Freshwater | 13 | 200 | Semi-aggressive | Some experience helps | |
| Texas Cichlid Herichthys cyanoguttatus | Freshwater | 25 | 350 | Aggressive | Suits a first tank | |
| Thick-Lipped Gourami Trichogaster labiosa | Freshwater | 8 | 80 | Peaceful | Suits a first tank | |
| Threadfin Acara Acarichthys heckelii | Freshwater | 18 | 250 | Peaceful | Some experience helps | |
| Threadfin Cardinalfish Zoramia leptacanthus | Marine | 6 | 100 | Peaceful | Suits a first tank | |
| Three-Lined Pencilfish Nannostomus trifasciatus | Freshwater | 3.5 | 50 | Peaceful | Some experience helps | |
| Tomini Tang Ctenochaetus tominiensis | Marine | 15 | 300 | Semi-aggressive | Some experience helps | |
| Trimac Cichlid Amphilophus trimaculatus | Freshwater | 35 | 450 | Aggressive | Some experience helps | |
| Twig Catfish Farlowella acus | Freshwater | 16 | 150 | Peaceful | Experienced keepers only | |
| Twinspot Goby Signigobius biocellatus | Marine | 8 | 150 | Peaceful | Experienced keepers only | |
| Two-Band Clownfish Amphiprion bicinctus | Marine | 13 | 200 | Semi-aggressive | Suits a first tank | |
| Two-Stripe Goby Valenciennea helsdingenii | Marine | 16 | 250 | Peaceful | Some experience helps | |
| Vermiculated Sailfin Pleco Pterygoplichthys disjunctivus | Freshwater | 50 | 600 | Peaceful | Suits a first tank | |
| White Top Peacock Cichlid Aulonocara hueseri | Freshwater | 8 | 200 | Semi-aggressive | Some experience helps | |
| Whitecheek Tang Acanthurus japonicus | Marine | 20 | 450 | Semi-aggressive | Some experience helps | |
| Wrestling Halfbeak Dermogenys pusilla | Freshwater | 6 | 70 | Peaceful | Some experience helps | |
| Yaeyama Blenny Ecsenius yaeyamaensis | Marine | 6 | 80 | Peaceful | Suits a first tank | |
| Zebra Dartfish Ptereleotris zebra | Marine | 11 | 150 | Peaceful | Suits a first tank | |
| Zebra Dwarf Lionfish Dendrochirus zebra | Marine | 18 | 200 | Predator | Some experience helps | |
| Zebra Otocinclus Otocinclus cocama | Freshwater | 4.4 | 60 | Peaceful | Experienced keepers only | |
| African Mudskipper Periophthalmus barbarus | Brackish | 15 | 150 | Aggressive | Experienced keepers only | |
| Amazon Leaffish Monocirrhus polyacanthus | Freshwater | 8 | 100 | Predator | Experienced keepers only | |
| Angelicus Catfish Synodontis angelicus | Freshwater | 22 | 250 | Semi-aggressive | Some experience helps | |
| Arulius Barb Dawkinsia arulius | Freshwater | 10 | 200 | Peaceful | Suits a first tank | |
| Asian Rummynose Tetra Sawbwa resplendens | Freshwater | 3 | 45 | Peaceful | Some experience helps | |
| Balzani's Eartheater Gymnogeophagus balzanii | Freshwater | 12 | 250 | Peaceful | Some experience helps | |
| Bandit Cory Corydoras metae | Freshwater | 4.8 | 70 | Peaceful | Suits a first tank | |
| Bearded Corydoras Scleromystax barbatus | Freshwater | 9.5 | 150 | Peaceful | Some experience helps | |
| Bengal Loach Botia dario | Freshwater | 12 | 180 | Peaceful | Some experience helps | |
| Black Bar Silver Dollar Myloplus schomburgkii | Freshwater | 25 | 500 | Peaceful | Some experience helps | |
| Black Piranha Serrasalmus rhombeus | Freshwater | 35 | 500 | Predator | Some experience helps | |
| Black Sharkminnow Labeo chrysophekadion | Freshwater | 60 | 1000 | Aggressive | Some experience helps | |
| Blackbelt Cichlid Vieja maculicauda | Freshwater | 25 | 450 | Aggressive | Some experience helps | |
| Blackwing Hatchetfish Carnegiella marthae | Freshwater | 3 | 54 | Peaceful | Experienced keepers only | |
| Blue Gularis Fundulopanchax sjostedti | Freshwater | 11 | 100 | Semi-aggressive | Some experience helps | |
| Blue Neon Cichlid Paracyprichromis nigripinnis | Freshwater | 9.5 | 150 | Peaceful | Some experience helps | |
| Blue Orchid Peacock Aulonocara kandeense | Freshwater | 9 | 200 | Semi-aggressive | Some experience helps | |
| Blue Panchax Aplocheilus panchax | Freshwater | 7 | 70 | Peaceful | Suits a first tank | |
| Bristlenose Catfish Ancistrus temminckii | Freshwater | 10 | 80 | Peaceful | Suits a first tank | |
| Bumblebee Goby Brachygobius xanthozona | Brackish | 3.8 | 45 | Peaceful | Some experience helps | |
| Butterfly Barb Enteromius hulstaerti | Freshwater | 3.5 | 45 | Peaceful | Experienced keepers only | |
| Butterfly Goodeid Ameca splendens | Freshwater | 8 | 100 | Semi-aggressive | Suits a first tank | |
| Clown Rasbora Rasbora kalochroma | Freshwater | 8 | 120 | Peaceful | Some experience helps | |
| Copadichromis Azureus Copadichromis azureus | Freshwater | 15 | 300 | Peaceful | Some experience helps | |
| Costello Tetra Hemigrammus hyanuary | Freshwater | 4.5 | 70 | Peaceful | Suits a first tank | |
| Crimson-Spotted Rainbowfish Melanotaenia duboulayi | Freshwater | 9 | 150 | Peaceful | Suits a first tank | |
| Dwarf Macculloch's Rainbowfish Melanotaenia maccullochi | Freshwater | 6 | 70 | Peaceful | Suits a first tank | |
| Dwarf Snakehead Channa gachua | Freshwater | 20 | 200 | Predator | Some experience helps | |
| Dwarf Spotted Danio Danio nigrofasciatus | Freshwater | 3.5 | 54 | Peaceful | Suits a first tank | |
| Eastern Mosquitofish Gambusia holbrooki | Freshwater | 4.5 | 45 | Aggressive | Suits a first tank | |
| Egyptian Mouthbrooder Pseudocrenilabrus multicolor | Freshwater | 7.5 | 80 | Semi-aggressive | Suits a first tank | |
| Elegant Cory Corydoras elegans | Freshwater | 5 | 70 | Peaceful | Suits a first tank | |
| Emerald Betta Betta smaragdina | Freshwater | 6.5 | 45 | Peaceful | Some experience helps | |
| Emerald Eye Rasbora Brevibora dorsiocellata | Freshwater | 3 | 45 | Peaceful | Some experience helps | |
| Empire Gudgeon Hypseleotris compressa | Freshwater | 8 | 80 | Peaceful | Suits a first tank | |
| False Rummy-Nose Tetra Petitella georgiae | Freshwater | 4.5 | 70 | Peaceful | Some experience helps | |
| Flagtail Catfish Dianema urostriatum | Freshwater | 8.5 | 120 | Peaceful | Some experience helps | |
| Flagtail Prochilodus Semaprochilodus taeniurus | Freshwater | 25 | 450 | Semi-aggressive | Some experience helps | |
| Fossorochromis Rostratus Fossorochromis rostratus | Freshwater | 24 | 550 | Semi-aggressive | Some experience helps | |
| Four-Eyed Fish Anableps anableps | Brackish | 25 | 300 | Peaceful | Some experience helps | |
| Fourspine Cichlid Neolamprologus tetracanthus | Freshwater | 16 | 300 | Aggressive | Some experience helps | |
| Giant Kuhli Loach Pangio myersi | Freshwater | 10 | 70 | Peaceful | Suits a first tank | |
| Glowlight Rasbora Trigonopoma pauciperforatum | Freshwater | 5 | 60 | Peaceful | Some experience helps | |
| Gold Tetra Hemigrammus rodwayi | Freshwater | 4.5 | 60 | Peaceful | Suits a first tank | |
| Golden Whiptail Catfish Sturisomatichthys aureus | Freshwater | 18 | 150 | Peaceful | Some experience helps | |
| Hujeta Gar Ctenolucius hujeta | Freshwater | 22 | 300 | Predator | Some experience helps | |
| Knight Goby Stigmatogobius sadanundio | Brackish | 8 | 80 | Semi-aggressive | Some experience helps | |
| Least Killifish Heterandria formosa | Freshwater | 2.5 | 30 | Peaceful | Suits a first tank | |
| Lesser Bleeding Heart Tetra Megalamphodus socolofi | Freshwater | 5 | 80 | Peaceful | Suits a first tank | |
| Marbled Bichir Polypterus palmas | Freshwater | 28 | 300 | Predator | Suits a first tank | |
| Marbled Headstander Abramites hypselonotus | Freshwater | 14 | 200 | Semi-aggressive | Some experience helps | |
| Mayan Cichlid Mayaheros urophthalmus | Freshwater | 28 | 350 | Aggressive | Suits a first tank | |
| Mbu Puffer Tetraodon mbu | Freshwater | 65 | 1500 | Semi-aggressive | Experienced keepers only | |
| Melon Barb Haludaria fasciata | Freshwater | 6 | 90 | Peaceful | Some experience helps | |
| Moonlight Gourami Trichopodus microlepis | Freshwater | 13 | 120 | Peaceful | Suits a first tank | |
| One-Lined Pencilfish Nannostomus unifasciatus | Freshwater | 4 | 60 | Peaceful | Some experience helps | |
| Ornate Ctenopoma Microctenopoma ansorgii | Freshwater | 6 | 70 | Peaceful | Some experience helps | |
| Panda Dwarf Cichlid Apistogramma nijsseni | Freshwater | 5 | 70 | Semi-aggressive | Some experience helps | |
| Pearly Rasbora Rasboroides vaterifloris | Freshwater | 4 | 60 | Peaceful | Experienced keepers only | |
| Pinktail Chalceus Chalceus macrolepidotus | Freshwater | 22 | 350 | Predator | Some experience helps | |
| Polka Dot Pleco (L201) Hypancistrus contradens | Freshwater | 10 | 90 | Peaceful | Some experience helps | |
| Polystigma Cichlid Nimbochromis polystigma | Freshwater | 22 | 450 | Predator | Some experience helps | |
| Protomelas Fenestratus Protomelas fenestratus | Freshwater | 14 | 300 | Semi-aggressive | Some experience helps | |
| Protomelas Spilonotus Protomelas spilonotus | Freshwater | 16 | 350 | Semi-aggressive | Some experience helps | |
| Rainbow Snakehead Channa bleheri | Freshwater | 15 | 150 | Predator | Some experience helps | |
| Rainbow Tetra Nematobrycon lacortei | Freshwater | 4 | 70 | Peaceful | Some experience helps | |
| Red-Necked Dwarf Cichlid Apistogramma viejita | Freshwater | 5 | 60 | Peaceful | Some experience helps | |
| Red-Striped Killifish Aphyosemion striatum | Freshwater | 5 | 45 | Peaceful | Some experience helps | |
| Red-Tailed Tinfoil Barb Barbonymus altus | Freshwater | 22 | 450 | Peaceful | Suits a first tank | |
| Redhead Cichlid Vieja melanurus | Freshwater | 30 | 500 | Aggressive | Some experience helps | |
| Reticulated Algae Eater Crossocheilus reticulatus | Freshwater | 15 | 200 | Peaceful | Suits a first tank | |
| Ruby Tetra Axelrodia riesei | Freshwater | 2 | 45 | Peaceful | Some experience helps | |
| Sardine Cichlid Cyprichromis leptosoma | Freshwater | 10 | 200 | Peaceful | Some experience helps | |
| Schouteden's Puffer Tetraodon schoutedeni | Freshwater | 9 | 100 | Peaceful | Some experience helps | |
| Silver Hatchetfish Thoracocharax stellatus | Freshwater | 6.5 | 90 | Peaceful | Some experience helps | |
| Six-Bar Distichodus Distichodus sexfasciatus | Freshwater | 50 | 900 | Semi-aggressive | Some experience helps | |
| Skunk Loach Yasuhikotakia morleti | Freshwater | 8 | 150 | Aggressive | Some experience helps | |
| Spiny Talking Catfish Acanthodoras spinosissimus | Freshwater | 13 | 150 | Peaceful | Suits a first tank | |
| Splash Tetra Copella arnoldi | Freshwater | 4 | 60 | Peaceful | Some experience helps | |
| Spotted Archerfish Toxotes chatareus | Brackish | 25 | 400 | Predator | Some experience helps | |
| Spotted Headstander Chilodus punctatus | Freshwater | 10 | 120 | Peaceful | Some experience helps | |
| Spotted Metynnis Metynnis maculatus | Freshwater | 15 | 300 | Peaceful | Suits a first tank | |
| Steveni Taiwan Reef Peacock Aulonocara steveni | Freshwater | 11 | 240 | Semi-aggressive | Some experience helps | |
| Striped Eel Catfish Plotosus lineatus | Marine | 25 | 450 | Semi-aggressive | Some experience helps | |
| Sun Catfish Horabagrus brachysoma | Freshwater | 30 | 450 | Predator | Some experience helps | |
| T-Bar Cichlid Amatitlania sajica | Freshwater | 9 | 150 | Semi-aggressive | Suits a first tank | |
| Tailspot Cory Corydoras caudimaculatus | Freshwater | 4.5 | 70 | Peaceful | Suits a first tank | |
| Tailspot Hoplo Megalechis picta | Freshwater | 15 | 200 | Peaceful | Suits a first tank | |
| Tanganyikan Spiny Eel Mastacembelus ellipsifer | Freshwater | 40 | 450 | Semi-aggressive | Experienced keepers only | |
| Three-Striped Dwarf Cichlid Apistogramma trifasciata | Freshwater | 4.5 | 60 | Semi-aggressive | Some experience helps | |
| Ticto Barb Pethia ticto | Freshwater | 6.5 | 90 | Peaceful | Suits a first tank | |
| Tire Track Eel Mastacembelus armatus | Freshwater | 60 | 600 | Peaceful | Some experience helps | |
| Twoband Killifish Aphyosemion bivittatum | Freshwater | 5 | 45 | Peaceful | Some experience helps | |
| Uaru Uaru amphiacanthoides | Freshwater | 25 | 400 | Peaceful | Experienced keepers only | |
| Western Rainbowfish Melanotaenia australis | Freshwater | 9 | 120 | Peaceful | Suits a first tank | |
| African Banded Barb Enteromius fasciolatus | Freshwater | 6 | 90 | Peaceful | Some experience helps | |
| African Debauwi Catfish Pareutropius debauwi | Freshwater | 8 | 120 | Peaceful | Some experience helps | |
| African Glass Catfish Parailia pellucida | Freshwater | 9 | 150 | Peaceful | Some experience helps | |
| African Pike Characin Hepsetus odoe | Freshwater | 35 | 500 | Predator | Some experience helps | |
| African Red-Eyed Tetra Arnoldichthys spilopterus | Freshwater | 9 | 150 | Peaceful | Some experience helps | |
| Agassiz's Cory Corydoras agassizii | Freshwater | 5.2 | 70 | Peaceful | Some experience helps | |
| Amiet's Lyretail Fundulopanchax amieti | Freshwater | 6.5 | 70 | Peaceful | Some experience helps | |
| Apollo Shark Luciosoma spilopleura | Freshwater | 20 | 350 | Peaceful | Some experience helps | |
| Armored Stickleback Indostomus paradoxus | Freshwater | 3 | 30 | Peaceful | Experienced keepers only | |
| Asian Moth Catfish Hara hara | Freshwater | 6.5 | 60 | Peaceful | Some experience helps | |
| Axelrod's Cory Corydoras axelrodi | Freshwater | 4.2 | 60 | Peaceful | Some experience helps | |
| Banded Ctenopoma Microctenopoma fasciolatum | Freshwater | 7.5 | 80 | Peaceful | Some experience helps | |
| Banded Knifefish Gymnotus carapo | Freshwater | 40 | 500 | Aggressive | Some experience helps | |
| Barred Mudskipper Periophthalmus argentilineatus | Brackish | 15 | 150 | Semi-aggressive | Some experience helps | |
| Bengal Danio Devario devario | Freshwater | 8.5 | 110 | Peaceful | Suits a first tank | |
| Betta Coccina Betta coccina | Freshwater | 4.5 | 40 | Peaceful | Experienced keepers only | |
| Black Acara Cichlasoma bimaculatum | Freshwater | 12 | 150 | Semi-aggressive | Suits a first tank | |
| Black Pearl Killifish Argolebias nigripinnis | Freshwater | 5 | 40 | Peaceful | Some experience helps | |
| Blackband Tetra Hyphessobrycon scholzei | Freshwater | 4 | 60 | Peaceful | Suits a first tank | |
| Blackbelly Limia Limia melanogaster | Freshwater | 4 | 50 | Peaceful | Suits a first tank | |
| Blackchin Sand Cichlid Xenotilapia melanogenys | Freshwater | 14 | 300 | Peaceful | Experienced keepers only | |
| Blacksail Cory Corydoras melanistius | Freshwater | 5.1 | 70 | Peaceful | Suits a first tank | |
| Bleher's Rainbowfish Chilatherina bleheri | Freshwater | 11 | 180 | Peaceful | Some experience helps | |
| Bloch's Catfish Pimelodus blochii | Freshwater | 22 | 300 | Peaceful | Suits a first tank | |
| Blue Congo Dwarf Cichlid Nanochromis parilus | Freshwater | 6 | 75 | Semi-aggressive | Some experience helps | |
| Blue Danio Danio kerri | Freshwater | 5 | 70 | Peaceful | Suits a first tank | |
| Blue Flash Cichlid Thorichthys aureus | Freshwater | 13 | 200 | Semi-aggressive | Some experience helps | |
| Blue Line Rasbora Rasbora einthovenii | Freshwater | 8 | 110 | Peaceful | Some experience helps | |
| Blue-Eye Cichlid Cryptoheros spilurus | Freshwater | 11 | 120 | Semi-aggressive | Suits a first tank | |
| Bronze Featherback Notopterus notopterus | Freshwater | 35 | 400 | Predator | Some experience helps | |
| Brown Hoplo Hoplosternum littorale | Freshwater | 20 | 250 | Peaceful | Suits a first tank | |
| Brown Julie Telmatochromis temporalis | Freshwater | 9.5 | 150 | Aggressive | Some experience helps | |
| Brown Spiketail Paradisefish Pseudosphromenus dayi | Freshwater | 5 | 45 | Peaceful | Some experience helps | |
| Brunei Beauty Betta macrostoma | Freshwater | 9 | 100 | Peaceful | Experienced keepers only | |
| Burton's Mouthbrooder Astatotilapia burtoni | Freshwater | 12 | 180 | Aggressive | Suits a first tank | |
| Ceylon Combtail Belontia signata | Freshwater | 13 | 150 | Semi-aggressive | Some experience helps | |
| Ceylon Puffer Dichotomyctere fluviatilis | Brackish | 15 | 200 | Aggressive | Some experience helps | |
| Chameleon Cichlid Australoheros facetus | Freshwater | 17 | 250 | Aggressive | Suits a first tank | |
| Chipokae Cichlid Melanochromis chipokae | Freshwater | 12 | 250 | Aggressive | Some experience helps | |
| Chocolate Striped Catfish Synodontis flavitaeniatus | Freshwater | 15 | 200 | Peaceful | Some experience helps | |
| Climbing Perch Anabas testudineus | Freshwater | 18 | 150 | Semi-aggressive | Suits a first tank | |
| Clown Barb Barbodes everetti | Freshwater | 14 | 250 | Peaceful | Suits a first tank | |
| Clown Catfish Synodontis decorus | Freshwater | 25 | 350 | Peaceful | Some experience helps | |
| Colombian Zebra Pleco (L129) Hypancistrus debilittera | Freshwater | 7.5 | 70 | Peaceful | Some experience helps | |
| Common Wolf Fish Hoplias malabaricus | Freshwater | 45 | 600 | Aggressive | Some experience helps | |
| Cuban Cichlid Nandopsis tetracanthus | Freshwater | 20 | 350 | Aggressive | Some experience helps | |
| Cupid Cichlid Biotodoma cupido | Freshwater | 11 | 200 | Peaceful | Some experience helps | |
| Darter Tetra Characidium fasciatum | Freshwater | 6.5 | 70 | Peaceful | Some experience helps | |
| Deissner's Licorice Gourami Parosphromenus deissneri | Freshwater | 3 | 45 | Peaceful | Experienced keepers only | |
| Double-Barred Rabbitfish Siganus virgatus | Marine | 25 | 500 | Peaceful | Some experience helps | |
| Dwerg Tiger Barb Puntigrus partipentazona | Freshwater | 4.5 | 75 | Peaceful | Suits a first tank | |
| Eggers' Notho Nothobranchius eggersi | Freshwater | 5 | 30 | Peaceful | Some experience helps | |
| Elongate Mbuna Chindongo elongatus | Freshwater | 9.5 | 200 | Aggressive | Some experience helps | |
| Eurasian Minnow Phoxinus phoxinus | Freshwater | 8 | 120 | Peaceful | Some experience helps | |
| European Bitterling Rhodeus amarus | Freshwater | 7 | 80 | Peaceful | Suits a first tank | |
| Everglades Pygmy Sunfish Elassoma evergladei | Freshwater | 3 | 30 | Peaceful | Some experience helps | |
| False Bandit Cory Corydoras melini | Freshwater | 5 | 70 | Peaceful | Some experience helps | |
| False Firemouth Cichlid Cribroheros robertsoni | Freshwater | 17 | 250 | Semi-aggressive | Suits a first tank | |
| False Spotted Cory Corydoras leucomelas | Freshwater | 4.5 | 75 | Peaceful | Suits a first tank | |
| Featherfin Cichlid Cyathopharynx furcifer | Freshwater | 18 | 450 | Semi-aggressive | Some experience helps | |
| Featherfin Tetra Hemigrammus unilineatus | Freshwater | 5.3 | 70 | Peaceful | Suits a first tank | |
| Five-Spot Jewel Cichlid Hemichromis fasciatus | Freshwater | 18 | 300 | Aggressive | Some experience helps | |
| Flag Tetra Hyphessobrycon heterorhabdus | Freshwater | 3.5 | 60 | Peaceful | Suits a first tank | |
| Flagfin Prawn Goby Mahidolia mystacina | Marine | 7.5 | 80 | Peaceful | Suits a first tank | |
| Flagtail Corydoras Corydoras robineae | Freshwater | 4.5 | 80 | Peaceful | Some experience helps | |
| Flying Barb Esomus danrica | Freshwater | 9 | 100 | Peaceful | Suits a first tank | |
| Fusco Cichlid Nimbochromis fuscotaeniatus | Freshwater | 22 | 500 | Aggressive | Some experience helps | |
| Gary Lange's Rainbowfish Melanotaenia garylangei | Freshwater | 7.5 | 120 | Peaceful | Some experience helps | |
| Geayi Cichlid Guianacara geayi | Freshwater | 11.5 | 180 | Semi-aggressive | Some experience helps | |
| Giant Hatchetfish Thoracocharax securis | Freshwater | 6.8 | 120 | Peaceful | Some experience helps | |
| Golden Barb Pethia gelius | Freshwater | 4 | 50 | Peaceful | Suits a first tank | |
| Golden Barb Puntius sachsii | Freshwater | 7 | 90 | Peaceful | Suits a first tank | |
| Golden Shiner Notemigonus crysoleucas | Freshwater | 18 | 250 | Peaceful | Suits a first tank | |
| Golden Snakehead Channa stewartii | Freshwater | 25 | 250 | Aggressive | Some experience helps | |
| Goldspotted Rabbitfish Siganus guttatus | Marine | 30 | 600 | Peaceful | Some experience helps | |
| Gosse's Cory Corydoras gossei | Freshwater | 5.5 | 80 | Peaceful | Some experience helps | |
| Green Chromide Etroplus suratensis | Brackish | 25 | 400 | Peaceful | Some experience helps | |
| Green Gold Cory Corydoras melanotaenia | Freshwater | 5.5 | 80 | Peaceful | Suits a first tank | |
| Guenther's Mouthbrooder Chromidotilapia guntheri | Freshwater | 15 | 200 | Peaceful | Some experience helps | |
| Gymnogenys Eartheater Gymnogeophagus gymnogenys | Freshwater | 14 | 250 | Peaceful | Some experience helps | |
| Harrison's Pencilfish Nannostomus harrisoni | Freshwater | 4.5 | 60 | Peaceful | Some experience helps | |
| Hognose Brochis Corydoras multiradiatus | Freshwater | 8.5 | 150 | Peaceful | Some experience helps | |
| Humpbacked Limia Limia nigrofasciata | Freshwater | 5.2 | 70 | Peaceful | Suits a first tank | |
| Hystrix River Ray Potamotrygon histrix | Freshwater | 35 | 700 | Predator | Experienced keepers only | |
| Indian Featherback Chitala chitala | Freshwater | 60 | 1000 | Predator | Some experience helps | |
| Inspector Pleco Hypancistrus inspector | Freshwater | 12 | 120 | Peaceful | Some experience helps | |
| Jae Barb Enteromius jae | Freshwater | 3.5 | 54 | Peaceful | Some experience helps | |
| Jaguar Catfish Liosomadoras oncinus | Freshwater | 16 | 200 | Peaceful | Some experience helps | |
| Jellybean Tetra Lepidarchus adonis | Freshwater | 2.2 | 45 | Peaceful | Experienced keepers only | |
| Jellybean Tetra Ladigesia roloffi | Freshwater | 3 | 60 | Peaceful | Experienced keepers only | |
| Korthaus' Killifish Nothobranchius korthausae | Freshwater | 5 | 40 | Peaceful | Some experience helps | |
| Lake Wanam Rainbowfish Glossolepis wanamensis | Freshwater | 9 | 150 | Peaceful | Some experience helps | |
| Latticed Butterflyfish Chaetodon rafflesii | Marine | 15 | 300 | Peaceful | Some experience helps | |
| Leopard Cactus Pleco Pseudacanthicus leopardus | Freshwater | 25 | 450 | Semi-aggressive | Some experience helps | |
| Leopard Cory Corydoras leopardus | Freshwater | 6 | 80 | Peaceful | Suits a first tank | |
| Lesser Spiny Eel Macrognathus aculeatus | Freshwater | 25 | 200 | Peaceful | Some experience helps | |
| Linni Cichlid Nimbochromis linni | Freshwater | 25 | 600 | Predator | Some experience helps | |
| Long-Nose Featherfin Cichlid Ophthalmotilapia nasuta | Freshwater | 18 | 350 | Semi-aggressive | Experienced keepers only | |
| Loreto Tetra Hyphessobrycon loretoensis | Freshwater | 2.5 | 54 | Peaceful | Some experience helps | |
| Malawi Synodontis Synodontis njassae | Freshwater | 18 | 300 | Peaceful | Suits a first tank | |
| Meridionalis Eartheater Gymnogeophagus meridionalis | Freshwater | 9.5 | 150 | Peaceful | Some experience helps | |
| Merry Widow Livebearer Phallichthys amates | Freshwater | 5 | 50 | Peaceful | Suits a first tank | |
| Metallic Livebearer Girardinus metallicus | Freshwater | 5 | 50 | Peaceful | Suits a first tank | |
| Montezuma Swordtail Xiphophorus montezumae | Freshwater | 6.5 | 120 | Peaceful | Some experience helps | |
| Mosaic Cory Corydoras haraldschultzi | Freshwater | 6 | 80 | Peaceful | Suits a first tank | |
| Murray River Rainbowfish Melanotaenia fluviatilis | Freshwater | 9 | 150 | Peaceful | Suits a first tank | |
| Needlefish Xenentodon cancila | Freshwater | 25 | 300 | Predator | Some experience helps | |
| Neolamprologus Buescheri Neolamprologus buescheri | Freshwater | 7 | 100 | Aggressive | Some experience helps | |
| Neon Stiphodon Goby Stiphodon semoni | Freshwater | 4.6 | 60 | Peaceful | Experienced keepers only | |
| Ocellated Kribensis Pelvicachromis subocellatus | Freshwater | 5.5 | 75 | Peaceful | Some experience helps | |
| Ocellated Snakehead Channa pleurophthalma | Freshwater | 35 | 500 | Predator | Some experience helps | |
| One-Spot Livebearer Phalloceros caudimaculatus | Freshwater | 3.5 | 45 | Peaceful | Suits a first tank | |
| Ophthalmotilapia Ventralis Ophthalmotilapia ventralis | Freshwater | 14 | 300 | Semi-aggressive | Experienced keepers only | |
| Ornate Pimelodus Pimelodus ornatus | Freshwater | 28 | 450 | Peaceful | Some experience helps | |
| Pearl of Likoma Labidochromis joanjohnsonae | Freshwater | 9 | 180 | Aggressive | Some experience helps | |
| Plumed Lyretail Fundulopanchax filamentosus | Freshwater | 5.5 | 60 | Peaceful | Some experience helps | |
| Popondetta Blue-Eye Pseudomugil connieae | Freshwater | 5 | 60 | Peaceful | Some experience helps | |
| Porthole Catfish Dianema longibarbis | Freshwater | 9.5 | 120 | Peaceful | Suits a first tank | |
| Porthole Shovelnose Catfish Hemisorubim platyrhynchos | Freshwater | 45 | 800 | Predator | Some experience helps | |
| Pot-Bellied Seahorse Hippocampus abdominalis | Marine | 25 | 300 | Peaceful | Experienced keepers only | |
| Pseudotropheus Aurora Maylandia aurora | Freshwater | 9 | 200 | Aggressive | Some experience helps | |
| Pseudotropheus Flavus Chindongo flavus | Freshwater | 8.5 | 200 | Aggressive | Some experience helps | |
| Pumpkinseed Lepomis gibbosus | Freshwater | 18 | 250 | Semi-aggressive | Suits a first tank | |
| Pygmy Swordtail Xiphophorus pygmaeus | Freshwater | 4 | 50 | Peaceful | Some experience helps | |
| Rabaut's Corydoras Corydoras rabauti | Freshwater | 5 | 70 | Peaceful | Suits a first tank | |
| Red Speck Cichlid Vieja bifasciata | Freshwater | 28 | 450 | Aggressive | Some experience helps | |
| Red-Striped Rainbowfish Melanotaenia rubrostriata | Freshwater | 12 | 180 | Peaceful | Suits a first tank | |
| Red-Tailed Loach Yasuhikotakia lecontei | Freshwater | 13 | 200 | Semi-aggressive | Some experience helps | |
| Redspotted Tetra Copeina guttata | Freshwater | 7.5 | 100 | Peaceful | Suits a first tank | |
| Redtail Splitfin Xenotoca eiseni | Freshwater | 6 | 80 | Semi-aggressive | Suits a first tank | |
| Reticulated Corydoras Corydoras reticulatus | Freshwater | 6.1 | 80 | Peaceful | Suits a first tank | |
| Rio Pearlfish Nematolebias whitei | Freshwater | 7 | 45 | Peaceful | Some experience helps | |
| Rosy Bitterling Rhodeus ocellatus | Freshwater | 6.5 | 80 | Peaceful | Suits a first tank | |
| Saddleback Loach Homaloptera orthogoniata | Freshwater | 11 | 150 | Peaceful | Experienced keepers only | |
| Savoryi Cichlid Neolamprologus savoryi | Freshwater | 7.5 | 150 | Aggressive | Some experience helps | |
| Scheel's Lyretail Fundulopanchax scheeli | Freshwater | 6 | 60 | Peaceful | Suits a first tank | |
| Schwartz's Corydoras Corydoras schwartzi | Freshwater | 4.5 | 75 | Peaceful | Suits a first tank | |
| Semaprochilodus Insignis Semaprochilodus insignis | Freshwater | 25 | 500 | Peaceful | Some experience helps | |
| Sheepshead Minnow Cyprinodon variegatus | Brackish | 6 | 80 | Semi-aggressive | Suits a first tank | |
| Short-Line Penguin Tetra Thayeria obliqua | Freshwater | 6.5 | 90 | Peaceful | Suits a first tank | |
| Siamese Tigerfish Datnioides pulcher | Freshwater | 35 | 700 | Predator | Some experience helps | |
| Signatus Shell Dweller Lamprologus signatus | Freshwater | 5 | 60 | Semi-aggressive | Some experience helps | |
| Silver Hatchetfish Gasteropelecus levis | Freshwater | 3.5 | 60 | Peaceful | Some experience helps | |
| Silver Scat Selenotoca multifasciata | Brackish | 25 | 450 | Peaceful | Some experience helps | |
| Six-Bar Lamprologus Neolamprologus sexfasciatus | Freshwater | 14 | 250 | Aggressive | Some experience helps | |
| Six-Barred Panchax Epiplatys sexfasciatus | Freshwater | 8 | 90 | Predator | Some experience helps | |
| Sixray Corydoras Aspidoras pauciradiatus | Freshwater | 2.9 | 50 | Peaceful | Some experience helps | |
| Slender Telmatochromis Telmatochromis vittatus | Freshwater | 8 | 100 | Semi-aggressive | Some experience helps | |
| Southern Purple-Spotted Gudgeon Mogurnda adspersa | Freshwater | 11 | 120 | Semi-aggressive | Suits a first tank | |
| Spanner Barb Striuntius lateristriga | Freshwater | 15 | 250 | Peaceful | Suits a first tank | |
| Spiketail Paradisefish Pseudosphromenus cupanus | Freshwater | 6.5 | 60 | Peaceful | Suits a first tank | |
| Spotfin Corydoras Corydoras punctatus | Freshwater | 6 | 80 | Peaceful | Suits a first tank | |
| Spotted Raphael Catfish Platydoras hancockii | Freshwater | 14 | 150 | Peaceful | Suits a first tank | |
| Spotted Silver Dollar Metynnis lippincottianus | Freshwater | 15 | 300 | Peaceful | Suits a first tank | |
| Stappersii Shell Dweller Lamprologus stappersi | Freshwater | 5 | 60 | Semi-aggressive | Some experience helps | |
| Sterlet Acipenser ruthenus | Freshwater | 70 | 1500 | Peaceful | Experienced keepers only | |
| Stinging Catfish Heteropneustes fossilis | Freshwater | 30 | 300 | Predator | Some experience helps | |
| Stoliczka's Barb Pethia stoliczkana | Freshwater | 5 | 75 | Peaceful | Suits a first tank | |
| Striated Frogfish Antennarius striatus | Marine | 18 | 200 | Predator | Experienced keepers only | |
| Striped Barb Desmopuntius johorensis | Freshwater | 10 | 150 | Peaceful | Suits a first tank | |
| Striped Dwarf Catfish Mystus vittatus | Freshwater | 16 | 200 | Semi-aggressive | Suits a first tank | |
| Stripefin Eartheater Gymnogeophagus rhabdotus | Freshwater | 11 | 160 | Peaceful | Some experience helps | |
| Stripey Microcanthus strigatus | Marine | 15 | 300 | Peaceful | Some experience helps | |
| Sunset Rainbowfish Melanotaenia parva | Freshwater | 6.5 | 100 | Peaceful | Suits a first tank | |
| Super VC-10 Hap Placidochromis milomo | Freshwater | 18 | 450 | Semi-aggressive | Some experience helps | |
| Tanganyika Clown Goby Cichlid Eretmodus cyanostictus | Freshwater | 8.5 | 150 | Semi-aggressive | Experienced keepers only | |
| Tench Tinca tinca | Freshwater | 40 | 600 | Peaceful | Suits a first tank | |
| Tequila Splitfin Zoogoneticus tequila | Freshwater | 5.5 | 70 | Peaceful | Suits a first tank | |
| Tetrastigma Hap Otopharynx tetrastigma | Freshwater | 15 | 300 | Semi-aggressive | Some experience helps | |
| Three-Spined Stickleback Gasterosteus aculeatus | Freshwater | 7.5 | 80 | Semi-aggressive | Some experience helps | |
| Threespot Eartheater Satanoperca daemon | Freshwater | 18 | 350 | Peaceful | Experienced keepers only | |
| Tiger Loach Syncrossus hymenophysa | Freshwater | 18 | 300 | Aggressive | Some experience helps | |
| Toba Betta Betta rubra | Freshwater | 5 | 45 | Peaceful | Some experience helps | |
| Tropheus brichardi Tropheus brichardi | Freshwater | 10 | 300 | Aggressive | Experienced keepers only | |
| Tropheus Polli Tropheus polli | Freshwater | 14 | 350 | Aggressive | Some experience helps | |
| Two-Striped Lyretail Aphyosemion bitaeniatum | Freshwater | 5 | 50 | Peaceful | Some experience helps | |
| Whitemouth Moray Gymnothorax meleagris | Marine | 80 | 700 | Predator | Some experience helps | |
| Wormnose Elephantfish Campylomormyrus tamandua | Freshwater | 30 | 400 | Peaceful | Experienced keepers only | |
| Yellow Gularis Fundulopanchax gularis | Freshwater | 8 | 100 | Predator | Some experience helps | |
| Yellow Sand Cichlid Xenotilapia flavipinnis | Freshwater | 9 | 160 | Peaceful | Experienced keepers only | |
| Yellow Tetra Hyphessobrycon bifasciatus | Freshwater | 4.7 | 60 | Peaceful | Suits a first tank | |
| Yellow-Cheeked Sand Cichlid Xenotilapia ochrogenys | Freshwater | 11 | 250 | Peaceful | Experienced keepers only | |
| Yellowtail Congo Tetra Alestopetersius caudalis | Freshwater | 6 | 110 | Peaceful | Some experience helps | |
| Zebra Spiny Eel Macrognathus zebrinus | Freshwater | 30 | 300 | Peaceful | Some experience helps | |
| Zodiac Loach Nemacheilus triangularis | Freshwater | 5.5 | 80 | Peaceful | Some experience helps | |
| African Leaffish Polycentropsis abbreviata | Freshwater | 6.5 | 90 | Predator | Experienced keepers only | |
| African Moon Tetra Bathyaethiops caudomaculatus | Freshwater | 7.5 | 120 | Peaceful | Some experience helps | |
| Alluaud's Haplo Astatoreochromis alluaudi | Freshwater | 15 | 250 | Semi-aggressive | Suits a first tank | |
| Ambiacus Cory Corydoras ambiacus | Freshwater | 5 | 70 | Peaceful | Suits a first tank | |
| Amur Bitterling Rhodeus sericeus | Freshwater | 9 | 90 | Peaceful | Suits a first tank | |
| Ansorge's Neolebias Neolebias ansorgii | Freshwater | 2.6 | 40 | Peaceful | Some experience helps | |
| Argentine Pearlfish Austrolebias bellottii | Freshwater | 6 | 40 | Peaceful | Some experience helps | |
| Armored Catfish Callichthys callichthys | Freshwater | 18 | 200 | Peaceful | Suits a first tank | |
| Arrow Loach Nemacheilus masyae | Freshwater | 11 | 120 | Semi-aggressive | Some experience helps | |
| Australis Eartheater Gymnogeophagus australis | Freshwater | 15 | 250 | Semi-aggressive | Some experience helps | |
| Banded Acara Bujurquina vittata | Freshwater | 9 | 120 | Peaceful | Suits a first tank | |
| Banded Killifish Fundulus diaphanus | Brackish | 10 | 120 | Peaceful | Suits a first tank | |
| Banded Lampeye Aplocheilichthys spilauchen | Brackish | 7 | 80 | Peaceful | Some experience helps | |
| Banded Moray Gymnothorax rueppelliae | Marine | 75 | 450 | Predator | Some experience helps | |
| Banded Puffer Colomesus psittacus | Brackish | 25 | 400 | Aggressive | Experienced keepers only | |
| Bandit Pleco (L199) Hypancistrus furunculus | Freshwater | 12 | 100 | Peaceful | Some experience helps | |
| Bandtail Tetra Moenkhausia dichroura | Freshwater | 7 | 90 | Peaceful | Suits a first tank | |
| Banner Lyretail Aphyosemion calliurum | Freshwater | 5 | 45 | Peaceful | Some experience helps | |
| Barlow's Mbuna Maylandia barlowi | Freshwater | 8.1 | 200 | Aggressive | Some experience helps | |
| Basket Hap Mylochromis lateristriga | Freshwater | 18 | 400 | Peaceful | Some experience helps | |
| Belly Pipefish Hippichthys heptagonus | Brackish | 15 | 120 | Peaceful | Experienced keepers only | |
| Berdmore's Loach Syncrossus berdmorei | Freshwater | 15 | 250 | Aggressive | Some experience helps | |
| Bigeye Cichlid Acaronia nassa | Freshwater | 16 | 250 | Predator | Some experience helps | |
| Bigeye Squeaker Synodontis alberti | Freshwater | 18 | 200 | Peaceful | Suits a first tank | |
| Black Band Corydoras Corydoras zygatus | Freshwater | 5.5 | 70 | Peaceful | Suits a first tank | |
| Black Morpho Tetra Poecilocharax weitzmani | Freshwater | 4 | 54 | Peaceful | Experienced keepers only | |
| Black Ocellatus Shell Dweller Lamprologus speciosus | Freshwater | 5 | 60 | Semi-aggressive | Some experience helps | |
| Black-Banded Rainbowfish Melanotaenia nigrans | Freshwater | 7.5 | 100 | Peaceful | Suits a first tank | |
| Black-Stripe Dwarf Cichlid Taeniacara candidi | Freshwater | 4.5 | 60 | Peaceful | Experienced keepers only | |
| Blacktop Cory Corydoras acutus | Freshwater | 5.5 | 80 | Peaceful | Some experience helps | |
| Blue Cory Corydoras nattereri | Freshwater | 5.5 | 70 | Peaceful | Suits a first tank | |
| Blue Notho Nothobranchius patrizii | Freshwater | 4.5 | 30 | Peaceful | Some experience helps | |
| Blue-eye Pleco Panaque suttonorum | Freshwater | 28 | 450 | Peaceful | Experienced keepers only | |
| Blueback Blue-Eye Pseudomugil cyanodorsalis | Brackish | 3.5 | 45 | Peaceful | Some experience helps | |
| Bluefin Killifish Lucania goodei | Freshwater | 4.5 | 45 | Peaceful | Suits a first tank | |
| Bluegill Lepomis macrochirus | Freshwater | 25 | 300 | Semi-aggressive | Suits a first tank | |
| Bond's Cory Corydoras bondi | Freshwater | 4.7 | 70 | Peaceful | Suits a first tank | |
| Brieni Herring Cichlid Paracyprichromis brieni | Freshwater | 11 | 200 | Peaceful | Some experience helps | |
| Butterfly Sand Cichlid Xenotilapia papilio | Freshwater | 7.5 | 150 | Peaceful | Experienced keepers only | |
| Calliptera Cichlid Astatotilapia calliptera | Freshwater | 14 | 250 | Semi-aggressive | Suits a first tank | |
| Callipterus Shellie Lamprologus callipterus | Freshwater | 12.4 | 150 | Semi-aggressive | Some experience helps | |
| Callochromis macrops Callochromis macrops | Freshwater | 13.5 | 250 | Semi-aggressive | Some experience helps | |
| Callochromis pleurospilus Callochromis pleurospilus | Freshwater | 10 | 200 | Semi-aggressive | Some experience helps | |
| Cameroon Killifish Aphyosemion cameronense | Freshwater | 5 | 45 | Peaceful | Some experience helps | |
| Camouflage Banjo Catfish Bunocephalus amaurus | Freshwater | 12 | 100 | Peaceful | Suits a first tank | |
| Canara Pearl Danio Opsarius canarensis | Freshwater | 12 | 200 | Peaceful | Some experience helps | |
| Carolina Pygmy Sunfish Elassoma boehlkei | Freshwater | 3 | 30 | Peaceful | Some experience helps | |
| Cauvet's Killifish Scriptaphyosemion cauveti | Freshwater | 5 | 45 | Peaceful | Some experience helps | |
| Chalinochromis Brichardi Chalinochromis brichardi | Freshwater | 12 | 150 | Semi-aggressive | Some experience helps | |
| Chaper's Panchax Epiplatys chaperi | Freshwater | 5.5 | 55 | Peaceful | Suits a first tank | |
| Checkerboard Cichlid Crenicara punctulata | Freshwater | 8 | 90 | Peaceful | Some experience helps | |
| Chilotilapia Rhoadesii Chilotilapia rhoadesii | Freshwater | 22 | 500 | Semi-aggressive | Some experience helps | |
| Chisumulu Mbuna Labidochromis chisumulae | Freshwater | 7 | 150 | Aggressive | Some experience helps | |
| Chizumulu Peacock Cichlid Aulonocara korneliae | Freshwater | 7.5 | 200 | Semi-aggressive | Some experience helps | |
| Christy's Hap Aristochromis christyi | Freshwater | 28 | 800 | Predator | Some experience helps | |
| Christy's Lyretail Aphyosemion christyi | Freshwater | 5 | 40 | Peaceful | Some experience helps | |
| Cinnamon Killi Fundulopanchax cinnamomeus | Freshwater | 5.5 | 55 | Peaceful | Some experience helps | |
| Coffee-Bean Tetra Hyphessobrycon takasei | Freshwater | 3 | 54 | Peaceful | Suits a first tank | |
| Common Spiny Loach Lepidocephalichthys thermalis | Freshwater | 8 | 60 | Peaceful | Suits a first tank | |
| Common Woodcat Trachelyopterus galeatus | Freshwater | 20 | 250 | Predator | Suits a first tank | |
| Copadichromis Chrysonotus Copadichromis chrysonotus | Freshwater | 15 | 350 | Peaceful | Some experience helps | |
| Copadichromis Mbenjii Copadichromis mbenjii | Freshwater | 14 | 300 | Peaceful | Some experience helps | |
| Copadichromis Trewavasae Copadichromis trewavasae | Freshwater | 10.5 | 300 | Peaceful | Some experience helps | |
| Copadichromis Verduyni Copadichromis verduyni | Freshwater | 12 | 300 | Peaceful | Some experience helps | |
| Corumba Dwarf Cichlid Apistogramma commbrae | Freshwater | 4.5 | 70 | Peaceful | Some experience helps | |
| Corydoras Pulcher Corydoras pulcher | Freshwater | 5.5 | 80 | Peaceful | Some experience helps | |
| Crosshatch Goby Amblygobius decussatus | Marine | 9.5 | 120 | Peaceful | Some experience helps | |
| Crucian Carp Carassius carassius | Freshwater | 30 | 300 | Peaceful | Suits a first tank | |
| Cuban Killifish Cubanichthys cubensis | Freshwater | 6 | 60 | Peaceful | Some experience helps | |
| Cuban Limia Limia vittata | Freshwater | 8 | 80 | Peaceful | Suits a first tank | |
| Cuming's Barb Pethia cumingii | Freshwater | 5 | 70 | Peaceful | Suits a first tank | |
| Dadio Neochela dadiburjori | Freshwater | 2.5 | 50 | Peaceful | Some experience helps | |
| David's Upside-Down Catfish Synodontis contractus | Freshwater | 9.5 | 100 | Peaceful | Suits a first tank | |
| Delicate Swordtail Xiphophorus cortezi | Freshwater | 5 | 70 | Peaceful | Suits a first tank | |
| Dewindt's Mouthbrooder Aulonocranus dewindti | Freshwater | 14 | 300 | Peaceful | Some experience helps | |
| Dhonti Shellie Telmatochromis dhonti | Freshwater | 11 | 150 | Aggressive | Some experience helps | |
| Discus Tetra Brachychalcinus orbicularis | Freshwater | 9 | 150 | Peaceful | Some experience helps | |
| Dolphin Cichlid Krobia itanyi | Freshwater | 12 | 180 | Peaceful | Suits a first tank | |
| Dragonfin Tetra Pseudocorynopoma doriae | Freshwater | 6.5 | 120 | Peaceful | Some experience helps | |
| Dwarf Barb Pethia phutunio | Freshwater | 3.5 | 54 | Peaceful | Suits a first tank | |
| Dwarf Ctenopoma Microctenopoma nanum | Freshwater | 6.5 | 70 | Peaceful | Some experience helps | |
| Dwarf Hatchetfish Carnegiella myersi | Freshwater | 2.2 | 45 | Peaceful | Some experience helps | |
| Edith's Betta Betta edithae | Freshwater | 6.5 | 70 | Peaceful | Some experience helps | |
| Elongate Lamprologus Lepidiolamprologus elongatus | Freshwater | 28 | 450 | Aggressive | Some experience helps | |
| Espe's Pencilfish Nannostomus espei | Freshwater | 3.5 | 54 | Peaceful | Some experience helps | |
| Exquisite Rainbowfish Melanotaenia exquisita | Freshwater | 7 | 100 | Peaceful | Some experience helps | |
| Fairy Cory Corydoras atropersonatus | Freshwater | 4.5 | 60 | Peaceful | Suits a first tank | |
| False Blochi Cory Corydoras delphax | Freshwater | 5 | 70 | Peaceful | Suits a first tank | |
| False Network Corydoras Corydoras sodalis | Freshwater | 5 | 70 | Peaceful | Suits a first tank | |
| Fisher's Woodcat Trachelyopterus fisheri | Freshwater | 25 | 350 | Predator | Some experience helps | |
| Flametail Tetra Aphyocharax erythrurus | Freshwater | 5 | 70 | Peaceful | Suits a first tank | |
| Foersch's Betta Betta foerschi | Freshwater | 6 | 60 | Peaceful | Experienced keepers only | |
| Foersch's Killifish Nothobranchius foerschi | Freshwater | 5 | 35 | Peaceful | Some experience helps | |
| Gabon Killifish Aphyosemion gabunense | Freshwater | 5 | 45 | Peaceful | Some experience helps | |
| Gangetic Leaffish Nandus nandus | Freshwater | 16 | 180 | Predator | Some experience helps | |
| Garnet Minnow Aphyocypris lini | Freshwater | 4.5 | 60 | Peaceful | Suits a first tank | |
| Garnet Tetra Holopristis pulchra | Freshwater | 3.5 | 60 | Peaceful | Suits a first tank | |
| Gery's Killifish Scriptaphyosemion geryi | Freshwater | 5 | 45 | Peaceful | Some experience helps | |
| Giant Scissortail Rasbora caudimaculata | Freshwater | 15 | 250 | Peaceful | Some experience helps | |
| Girdled Goby Priolepis cincta | Marine | 5.5 | 50 | Peaceful | Some experience helps | |
| Golden Mola Hap Mylochromis incola | Freshwater | 18 | 400 | Peaceful | Some experience helps | |
| Golden Panchax Pachypanchax playfairii | Freshwater | 9 | 80 | Semi-aggressive | Suits a first tank | |
| Golden Sand-Eater Lethrinops auritus | Freshwater | 14 | 300 | Peaceful | Some experience helps | |
| Golden Skiffia Skiffia francesae | Freshwater | 5 | 60 | Peaceful | Some experience helps | |
| Golden Topminnow Fundulus chrysotus | Freshwater | 7 | 75 | Peaceful | Suits a first tank | |
| Graceful Pimelodella Pimelodella gracilis | Freshwater | 15 | 150 | Peaceful | Suits a first tank | |
| Green Face Peacock Cichlid Aulonocara saulosi | Freshwater | 9.2 | 200 | Semi-aggressive | Some experience helps | |
| Green Panchax Aplocheilus blockii | Brackish | 5 | 45 | Peaceful | Suits a first tank | |
| Green Rivulus Rivulus cylindraceus | Freshwater | 5.5 | 45 | Peaceful | Some experience helps | |
| Green Wolf Eel Congrogadus subducens | Marine | 35 | 300 | Predator | Suits a first tank | |
| Guapore Cory Corydoras guapore | Freshwater | 4.5 | 70 | Peaceful | Some experience helps | |
| Gudgeon Gobio gobio | Freshwater | 14 | 150 | Peaceful | Suits a first tank | |
| Guntea Loach Lepidocephalichthys guntea | Freshwater | 12 | 100 | Peaceful | Suits a first tank | |
| Guyana Leaffish Polycentrus schomburgkii | Brackish | 5.5 | 70 | Predator | Experienced keepers only | |
| Halfline Hemiodus Hemiodus semitaeniatus | Freshwater | 16 | 300 | Peaceful | Some experience helps | |
| Hard-bellied Silver Dollar Mylossoma duriventre | Freshwater | 20 | 400 | Peaceful | Suits a first tank | |
| Harlequin Shark Labeo cyclorhynchus | Freshwater | 15 | 250 | Aggressive | Some experience helps | |
| Humphead Glassfish Parambassis pulcinella | Freshwater | 8 | 150 | Peaceful | Some experience helps | |
| Indian Glass Barb Laubuka laubuca | Freshwater | 7 | 80 | Peaceful | Suits a first tank | |
| Inirida Dwarf Cichlid Apistogramma iniridae | Freshwater | 4.5 | 60 | Peaceful | Experienced keepers only | |
| Insignis Flag Cichlid Mesonauta insignis | Freshwater | 12 | 180 | Peaceful | Some experience helps | |
| Isidori's Elephantfish Pollimyrus isidori | Freshwater | 9 | 150 | Peaceful | Experienced keepers only | |
| Ivory Head Mloto Copadichromis mloto | Freshwater | 13 | 300 | Peaceful | Some experience helps | |
| Jalo Reef Afra Cynotilapia axelrodi | Freshwater | 7.5 | 150 | Aggressive | Some experience helps | |
| Javanese Ricefish Oryzias javanicus | Brackish | 3.5 | 45 | Peaceful | Suits a first tank | |
| Jeweled Splitfin Xenotoca variata | Freshwater | 6 | 70 | Peaceful | Suits a first tank | |
| Johnstoni Hap Placidochromis johnstoni | Freshwater | 18 | 400 | Peaceful | Some experience helps | |
| Kamaka Rainbowfish Melanotaenia kamaka | Freshwater | 6 | 100 | Peaceful | Suits a first tank | |
| Kendalli Lamprologus Lepidiolamprologus kendalli | Freshwater | 16 | 300 | Aggressive | Some experience helps | |
| King Tiger Pleco Hypancistrus seideli | Freshwater | 11.5 | 120 | Peaceful | Some experience helps | |
| Krabi Mouthbrooder Betta simplex | Freshwater | 6 | 60 | Peaceful | Some experience helps | |
| L235 Pleco Pseudolithoxus anthrax | Freshwater | 12.4 | 150 | Peaceful | Some experience helps | |
| Lake Eacham Rainbowfish Melanotaenia eachamensis | Freshwater | 6.5 | 90 | Peaceful | Suits a first tank | |
| Lake Malawi Snout Cichlid Hemitilapia oxyrhynchus | Freshwater | 18 | 400 | Peaceful | Some experience helps | |
| Liberian Killifish Scriptaphyosemion liberiense | Freshwater | 5 | 45 | Peaceful | Some experience helps | |
| Lined Barb Striuntius lineatus | Freshwater | 5 | 70 | Peaceful | Suits a first tank | |
| Lipstick Goby Sicyopus jonklaasi | Freshwater | 4.5 | 70 | Peaceful | Experienced keepers only | |
| Longear Sunfish Lepomis megalotis | Freshwater | 18 | 250 | Aggressive | Suits a first tank | |
| Malawi Gar Lichnochromis acuticeps | Freshwater | 14 | 350 | Predator | Some experience helps | |
| Malayan Betta Betta pugnax | Freshwater | 7 | 70 | Peaceful | Some experience helps | |
| Marbled Lyretail Fundulopanchax marmoratus | Freshwater | 6 | 55 | Peaceful | Some experience helps | |
| Marilyn's Pencilfish Nannostomus marilynae | Freshwater | 3.5 | 45 | Peaceful | Some experience helps | |
| Maze Rabbitfish Siganus vermiculatus | Marine | 35 | 700 | Peaceful | Some experience helps | |
| Midnight Catfish Auchenipterichthys thoracatus | Freshwater | 13 | 150 | Peaceful | Some experience helps | |
| Miniature Pencilfish Nannostomus anduzei | Freshwater | 1.6 | 40 | Peaceful | Experienced keepers only | |
| Mirabilis Killi Fundulopanchax mirabilis | Freshwater | 6.5 | 50 | Peaceful | Some experience helps | |
| Moorii Cichlid Variabilichromis moorii | Freshwater | 10 | 180 | Aggressive | Some experience helps | |
| Mottled Ctenopoma Ctenopoma weeksii | Freshwater | 11 | 120 | Predator | Some experience helps | |
| Mueller's Butterflyfish Chelmon muelleri | Marine | 18 | 350 | Peaceful | Some experience helps | |
| Mummichog Fundulus heteroclitus | Brackish | 12 | 150 | Peaceful | Suits a first tank | |
| Mustax Cichlid Neolamprologus mustax | Freshwater | 9 | 150 | Semi-aggressive | Some experience helps | |
| Napo Cory Corydoras napoensis | Freshwater | 4.5 | 60 | Peaceful | Suits a first tank | |
| Narrow-Striped Panchax Epiplatys fasciolatus | Freshwater | 8 | 80 | Peaceful | Some experience helps | |
| Neolamprologus Fasciatus Neolamprologus fasciatus | Freshwater | 15 | 200 | Aggressive | Some experience helps | |
| Neolamprologus Furcifer Neolamprologus furcifer | Freshwater | 14 | 200 | Aggressive | Some experience helps | |
| North New Guinea Rainbowfish Melanotaenia affinis | Freshwater | 11.5 | 180 | Peaceful | Some experience helps | |
| Northern Peacock Cichlid Aulonocara ethelwynnae | Freshwater | 7.5 | 200 | Semi-aggressive | Some experience helps | |
| Northern Redbelly Dace Chrosomus eos | Freshwater | 6.5 | 90 | Peaceful | Suits a first tank | |
| Northern Starhead Topminnow Fundulus dispar | Freshwater | 5 | 60 | Peaceful | Some experience helps | |
| Northern Studfish Fundulus catenatus | Freshwater | 15 | 200 | Peaceful | Some experience helps | |
| One-Line African Tetra Nannaethiops unitaeniatus | Freshwater | 6 | 70 | Peaceful | Some experience helps | |
| Onespot Betta Betta unimaculata | Freshwater | 12 | 120 | Peaceful | Some experience helps | |
| Onespot Squeaker Synodontis notatus | Freshwater | 22 | 300 | Semi-aggressive | Suits a first tank | |
| Opossum Pipefish Microphis brachyurus | Freshwater | 19 | 150 | Peaceful | Experienced keepers only | |
| Orange-Fin Apisto Apistogramma eunotus | Freshwater | 5 | 60 | Semi-aggressive | Some experience helps | |
| Orangespotted Sunfish Lepomis humilis | Freshwater | 10 | 150 | Semi-aggressive | Suits a first tank | |
| Orinoco Eartheater Biotodoma wavrini | Freshwater | 10 | 160 | Peaceful | Some experience helps | |
| Ornate Goby Stiphodon ornatus | Freshwater | 5 | 60 | Peaceful | Some experience helps | |
| Ornate Sand Cichlid Xenotilapia ornatipinnis | Freshwater | 12 | 250 | Peaceful | Experienced keepers only | |
| Ornate-Fin Shell Dweller Lamprologus ornatipinnis | Freshwater | 6.5 | 80 | Semi-aggressive | Some experience helps | |
| Owroewefi Acara Guianacara owroewefi | Freshwater | 10.5 | 180 | Peaceful | Some experience helps | |
| Panda Uaru Uaru fernandezyepezi | Freshwater | 18 | 400 | Peaceful | Experienced keepers only | |
| Pangani Notho Nothobranchius palmqvisti | Freshwater | 5 | 35 | Peaceful | Some experience helps | |
| Panuco Swordtail Xiphophorus nigrensis | Freshwater | 5.5 | 70 | Peaceful | Suits a first tank | |
| Parallel Striped Mbuna Melanochromis loriae | Freshwater | 11 | 240 | Aggressive | Some experience helps | |
| Pastel Cichlid Cribroheros alfari | Freshwater | 15 | 250 | Semi-aggressive | Some experience helps | |
| Pearl-Spotted Killifish Paraphanius mento | Freshwater | 5 | 60 | Semi-aggressive | Some experience helps | |
| Perspicax Mbuna Pseudotropheus perspicax | Freshwater | 8.1 | 200 | Aggressive | Some experience helps | |
| Peruvian Tetra Hyphessobrycon peruvianus | Freshwater | 4 | 60 | Peaceful | Suits a first tank | |
| Picotee Goodeid Zoogoneticus quitzeoensis | Freshwater | 4 | 60 | Semi-aggressive | Some experience helps | |
| Pikehead Luciocephalus pulcher | Freshwater | 18 | 200 | Predator | Experienced keepers only | |
| Platinum Acara Andinoacara latifrons | Freshwater | 16 | 200 | Semi-aggressive | Suits a first tank | |
| Port Cichlid Cichlasoma portalegrense | Freshwater | 12.9 | 150 | Peaceful | Suits a first tank | |
| Porthole Livebearer Poeciliopsis gracilis | Freshwater | 7 | 60 | Peaceful | Suits a first tank | |
| Poso Halfbeak Nomorhamphus celebensis | Freshwater | 8 | 110 | Peaceful | Some experience helps | |
| Protomelas Annectens Protomelas annectens | Freshwater | 18 | 400 | Peaceful | Some experience helps | |
| Protomelas Similis Protomelas similis | Freshwater | 17 | 350 | Peaceful | Some experience helps | |
| Protomelas Virgatus Protomelas virgatus | Freshwater | 14 | 300 | Semi-aggressive | Some experience helps | |
| Pseudotropheus Acei Pseudotropheus elegans | Freshwater | 13 | 250 | Peaceful | Suits a first tank | |
| Pseudotropheus Fainzilberi Maylandia fainzilberi | Freshwater | 12 | 250 | Aggressive | Some experience helps | |
| Pygmy Rainbowfish Melanotaenia pygmaea | Freshwater | 4.5 | 60 | Peaceful | Suits a first tank | |
| Queen of Siam Goby Mugilogobius rambaiae | Brackish | 4.2 | 50 | Peaceful | Some experience helps | |
| Rainbow Characodon Characodon lateralis | Freshwater | 4.5 | 60 | Semi-aggressive | Some experience helps | |
| Red Cactus Pleco Pseudacanthicus pitanga | Freshwater | 30 | 450 | Semi-aggressive | Some experience helps | |
| Red Princess Cichlid Xenotilapia nigrolabiata | Freshwater | 12 | 300 | Peaceful | Experienced keepers only | |
| Red Top Williamsi Pseudotropheus williamsi | Freshwater | 15 | 300 | Aggressive | Some experience helps | |
| Red-Spotted Killifish Aphyosemion cognatum | Freshwater | 5 | 45 | Peaceful | Some experience helps | |
| Redfin Notho Nothobranchius rubripinnis | Freshwater | 3.6 | 30 | Peaceful | Some experience helps | |
| Rio Meta Tetra Hyphessobrycon metae | Freshwater | 4 | 60 | Peaceful | Suits a first tank | |
| Rippled Coral Goby Gobiodon rivulatus | Marine | 4.5 | 40 | Peaceful | Some experience helps | |
| Round-Tailed Paradisefish Macropodus ocellatus | Freshwater | 8.6 | 80 | Semi-aggressive | Suits a first tank | |
| Rudd Scardinius erythrophthalmus | Freshwater | 30 | 600 | Peaceful | Suits a first tank | |
| Russel's Lionfish Pterois russelii | Marine | 30 | 450 | Predator | Some experience helps | |
| Saddle Cichlid Aequidens tetramerus | Freshwater | 17 | 250 | Semi-aggressive | Suits a first tank | |
| Sailfin Shiner Pteronotropis hypselopterus | Freshwater | 6.5 | 90 | Peaceful | Suits a first tank | |
| Sand Cichlid Xenotilapia bathyphila | Freshwater | 9.5 | 250 | Peaceful | Experienced keepers only | |
| Sharphead Eartheater Satanoperca acuticeps | Freshwater | 15 | 350 | Peaceful | Experienced keepers only | |
| Shelford's Loach Pangio shelfordii | Freshwater | 8 | 60 | Peaceful | Suits a first tank | |
| Shortfin Molly Poecilia mexicana | Brackish | 8 | 80 | Peaceful | Suits a first tank | |
| Shuttles Mudskipper Periophthalmus modestus | Brackish | 9 | 120 | Semi-aggressive | Some experience helps | |
| Silver Distichodus Distichodus affinis | Freshwater | 18 | 350 | Semi-aggressive | Some experience helps | |
| Silver Kuhli Loach Pangio anguillaris | Freshwater | 10 | 75 | Peaceful | Some experience helps | |
| Silver Tetra Tetragonopterus argenteus | Freshwater | 10 | 150 | Semi-aggressive | Some experience helps | |
| Slender Betta Betta bellica | Freshwater | 9.5 | 90 | Peaceful | Some experience helps | |
| Slender Sand Cichlid Xenotilapia leptura | Freshwater | 11 | 250 | Peaceful | Experienced keepers only | |
| Slender Tail Hap Buccochromis lepturus | Freshwater | 35 | 700 | Predator | Some experience helps | |
| Small-scaled Cyprichromis Cyprichromis microlepidotus | Freshwater | 11 | 300 | Peaceful | Some experience helps | |
| Snail Crusher Hap Trematocranus placodon | Freshwater | 22 | 500 | Peaceful | Some experience helps | |
| Spangled Cichlid Limnochromis auritus | Freshwater | 13 | 300 | Peaceful | Experienced keepers only | |
| Spectabilis Cichlid Caquetaia spectabilis | Freshwater | 18 | 300 | Predator | Some experience helps | |
| Spotfin Goby Cichlid Tanganicodus irsacae | Freshwater | 6.5 | 120 | Semi-aggressive | Some experience helps | |
| Spotted Barb Barbodes binotatus | Freshwater | 15 | 250 | Peaceful | Suits a first tank | |
| Spotted Hatchetfish Gasteropelecus maculatus | Freshwater | 6 | 90 | Peaceful | Some experience helps | |
| Spotted Hawkfish Cirrhitichthys aprinus | Marine | 10 | 150 | Semi-aggressive | Suits a first tank | |
| Spotted Killifish Nothobranchius orthonotus | Freshwater | 7.5 | 60 | Semi-aggressive | Some experience helps | |
| Spotted Rainbowfish Glossolepis maculosa | Freshwater | 5 | 70 | Peaceful | Some experience helps | |
| Spotted-Fin Sand Cichlid Xenotilapia spilopterus | Freshwater | 9.6 | 200 | Peaceful | Experienced keepers only | |
| Stone Loach Barbatula barbatula | Freshwater | 12 | 150 | Peaceful | Some experience helps | |
| Stripeback Hap Buccochromis nototaenia | Freshwater | 23 | 600 | Predator | Some experience helps | |
| Striped Glass Catfish Kryptopterus macrocephalus | Freshwater | 8 | 100 | Peaceful | Some experience helps | |
| Striped Woodcat Trachelyopterichthys taeniatus | Freshwater | 14 | 150 | Peaceful | Some experience helps | |
| Sun Loach Yasuhikotakia eos | Freshwater | 11 | 200 | Semi-aggressive | Some experience helps | |
| Swordtail Characin Corynopoma riisei | Freshwater | 5 | 70 | Peaceful | Suits a first tank | |
| Tanganyika Killifish Lamprichthys tanganicanus | Freshwater | 14 | 300 | Peaceful | Experienced keepers only | |
| Tanganyikan Zebra Spiny Eel Mastacembelus plagiostomus | Freshwater | 28 | 350 | Predator | Experienced keepers only | |
| Ten-Spotted Livebearer Cnesterodon decemmaculatus | Freshwater | 3.5 | 40 | Peaceful | Suits a first tank | |
| Tetraspilus Hap Otopharynx tetraspilus | Freshwater | 15 | 300 | Peaceful | Suits a first tank | |
| Thompson's Surgeonfish Acanthurus thompsoni | Marine | 23 | 600 | Peaceful | Some experience helps | |
| Threadfin Petrochromis Petrochromis trewavasae | Freshwater | 18 | 500 | Aggressive | Experienced keepers only | |
| Three-Spot Petrochromis Petrochromis polyodon | Freshwater | 20 | 600 | Aggressive | Experienced keepers only | |
| Three-Spot Torpedo Cichlid Exochochromis anagenys | Freshwater | 25 | 700 | Predator | Some experience helps | |
| Three-Stripe Croaking Gourami Trichopsis schalleri | Freshwater | 4.5 | 45 | Peaceful | Some experience helps | |
| Threeline Tetra Neolebias trilineatus | Freshwater | 3.3 | 45 | Peaceful | Some experience helps | |
| Threespot Headstander Pseudanos trimaculatus | Freshwater | 16 | 300 | Semi-aggressive | Some experience helps | |
| Tiger Limia Poecilia islai | Freshwater | 3.5 | 54 | Peaceful | Suits a first tank | |
| Tricoti Cichlid Benthochromis tricoti | Freshwater | 16.5 | 450 | Peaceful | Experienced keepers only | |
| Trout Cichlid Champsochromis caeruleus | Freshwater | 32 | 700 | Predator | Some experience helps | |
| Trout Goodeid Ilyodon furcidens | Freshwater | 7 | 120 | Semi-aggressive | Suits a first tank | |
| Twosaddle Corydoras Corydoras weitzmani | Freshwater | 5.5 | 70 | Peaceful | Some experience helps | |
| Twospot Rasbora Rasbora elegans | Freshwater | 13 | 200 | Peaceful | Suits a first tank | |
| Twostripe Pencilfish Nannostomus bifasciatus | Freshwater | 3.4 | 54 | Peaceful | Some experience helps | |
| Variable Lampeye Procatopus similis | Freshwater | 5.5 | 70 | Peaceful | Some experience helps | |
| Walker's Killi Fundulopanchax walkeri | Freshwater | 5.5 | 55 | Peaceful | Some experience helps | |
| Warty Banjo Catfish Bunocephalus verrucosus | Freshwater | 9.5 | 80 | Peaceful | Suits a first tank | |
| Whiptail Catfish Rineloricaria fallax | Freshwater | 15 | 120 | Peaceful | Suits a first tank | |
| Whiptail Catfish Dasyloricaria filamentosa | Freshwater | 25 | 200 | Peaceful | Some experience helps | |
| Wolasi Ricefish Oryzias wolasi | Freshwater | 3 | 50 | Peaceful | Suits a first tank | |
| Xingu Corydoras Corydoras xinguensis | Freshwater | 4 | 60 | Peaceful | Suits a first tank | |
| Yellow Acara Aequidens metae | Freshwater | 12.5 | 150 | Semi-aggressive | Suits a first tank | |
| Yellow Dwarf Cichlid Apistogramma pertensis | Freshwater | 4.5 | 60 | Peaceful | Some experience helps | |
| Yellow Hap Buccochromis rhoadesii | Freshwater | 32 | 600 | Predator | Some experience helps | |
| Yellow Phantom Tetra Hyphessobrycon roseus | Freshwater | 3 | 60 | Peaceful | Suits a first tank | |
| Yellowfin Chalceus Chalceus erythrurus | Freshwater | 20 | 350 | Semi-aggressive | Some experience helps | |
| Yellowhump Eartheater Geophagus pellegrini | Freshwater | 15.2 | 250 | Peaceful | Suits a first tank |
Put a whole stock together in the planner, or read how the numbers are worked out. Saltwater fish are also collected on the marine page.