Known also as Blue Devil, Electric Blue and Orangetail Blue Damselfish, it is native to the Indo-Pacific Ocean area. A hardy fish, it is often used in cycling a saltwater aquarium. The female is colored completely "electric" blue, while the male has an orange tail. This easy to care for fish is very colorful, hardy, active and a great fish for the beginning aquarist. It is the saltwater fish purchased the most in the United States.
Size: 3/4" to 1 1/2"; can get to a maximum of 2"
No. in Tank: Singularly or a mated pair
Tank: min. 30 gallons
Temperament: Semi-Aggressive. It gets more aggressive as it ages.
Food: (Omnivore) Needs a varied diet including such things as mysid shrimp, brine shrimp and marine algae.
Adaptation: If keeping a mated pair, they need to be introduced together. It needs hiding places, particularly caves, and room to swim. When feeling threatened, it will hide in a crevice and turn nearly black in color, returning to it's natural blue in a matter of seconds once it again feels safe.
Compatibility: Ideal for a reef system as it is not a threat to clams, corals or invertebrates. No docile fish should be in the aquarium due to this fish's aggressiveness. It will also harass fish many times its own size, while staying busy defending its small territory. Best tank-mates are other aggressive fish, including damselfish, except its own kind.