Neon Damselfish

Pomacentrus coelestis, the neon damselfish, is a species of damselfish in the family Pomacentridae. It is found in the Indo-Pacific. It can grow to a maximum size of 9 centimetres (3.5 in) in length. It occasionally makes its way into the aquarium trade.

Adapted from Wikipedia, licensed under CC BY-SA 4.0.