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is that not an Oscellate damsel (Pomacentrus vaiuli)? Looks a bit pointy-nosed in one pic, but don't know any wrasse with a single eyespot on the dorsal like that. I thought damsel when I first looked at the pics.
Definitely a damsel of some type (there are over 300) based on body and behavior. I haven't seen any with that exact coloration but my bet is some Oscellate variant.
The long nose in one pic is just distortion through the glass at the angle the pic was taken.
Pip Walters is probably correct (Pomacentrus vaiuli), but I can't see the top of the head to see whether it has a median stripe or not. If there is a stripe right down the midline of the head, it's a juvenile P. bankanensis. (This stripe is lacking in P. vaiuli.) There seems to be a bit of distortion in some of the photos, presumably because they were taken at an angle to avoid flash reflection.