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One-Spot Livebearer

Phalloceros caudimaculatus

Freshwater South America Usually captive bred

A petite, resilient livebearer showing silver-grey tones punctuated by dark flank spotting. It prefers cooler, unheated water and breeds readily without human intervention. Well suited to planted nano tanks, it flourishes on a varied diet of dried flakes, fine live food, and algae.

Also called: Dusky millions fish, One-spot livebearer, Speckled mosquitofish, Spottail mosquitofish.

3.5 cm adult length, drawn to scale. torpedo body.

Try it in the planner Opens a tank sized to its minimum with 5 fish added.

What it needs

ItemValueBecause
Adult length 3.5 cm Used for the Space check: the tank must be long enough for the fish to turn round.
Smallest tank 45 L, at least 45 cm long estimated The least water and floor length this species is kept in for good, as a single fish or smallest group.
Extra water per added fish 4 L estimated What each further fish adds once the minimum is met.
Waste load Class 1 of 5 estimated How much waste an adult makes against its size. Feeds the Load check.
Temperature 16 to 24 C Stock sharing a tank need overlapping ranges.
pH 7 to 8 Compared with tankmates in the Water check.
Hardness GH 8 to 20, KH 4 to 12 Degrees of general and carbonate hardness.
Flow Low Low-flow fish are stressed in a strong current.
Light Moderate Matched to the lighting class on the needs sheet.
Group size At least 5, ideally 8 Kept alone or in small numbers it hides, fades or turns on tankmates.
Temperament Peaceful Not territorial.
Swims in All levels Fish that use different levels share a tank more easily.
Lifespan About 3 years A fish is a long commitment.
Experience Suits a first tank A guide to how forgiving the species is of mistakes.
Jumps Yes Keep the tank covered.

Tags marked estimated are judged from the size and habits of the species rather than measured, so treat them as a sensible default.

Diet and tank layout

One-Spot Livebearer is an omnivore that swims in all levels of the tank. It is safe with plants. Give it some cover.

Tankmates

Works with

No close matches in the data. Check the pair tool.

Depends

Avoid

Compare any two fish on the compatibility page, or print the equipment for a stock on the needs sheet. How this is worked out: the method.