What exhibit/part of the aquarium was this fish in? The picture's too blurry to tell what kind of fish it is, but I might be able to find out what it is if I know what part of the aquarium it comes from.
@EternalPigeon Not to blurry for tell the fish: I'm able to identify it without knowing the exhibit. Well, with a bit of doubt between okinawae and citrinus, but one of these two definitely is.
@Kakapo I don't see any indication of citrinis stripes, but that could be simply due to photo quality. In my experience okinawae is more common in public aquaria, though I have seen citrinis too.