What is this guy?? Wouldn't slow down for a good pic but he was blue and flashed green and yellow as he turned. About 4 inches long. Was in an anemone and clownfish tank at the downtown aquarium.
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+1. Pomacentrus alleni.That looks like an Allen's damselfish, also called the Neon damsel, Pomacentrus alleni. It's one of the better-tempered damsels, and a group in a decent-sized tank can make a charming display.
~Bruce
Agree.That looks like an Allen's damselfish, also called the Neon damsel, Pomacentrus alleni. It's one of the better-tempered damsels, and a group in a decent-sized tank can make a charming display.
~Bruce
Hard to tell from the pictures, but with you mentioning that it flashed different colors, could it be a flashing tilefish?
Tile fish have a much more elongated body than the fish in the picture which is definitely an allens damsel, although you can only really make out a little yellow in the first picture.

