If my tank were a 5 ft tank, I would have put a long-nose butterfly fish in there... for some reason people think they aren't reef safe, when in fact the only thing my previous longnose butterfly fish picked on were the tubicle feet of the sandsifting starfish and small feather dusters.
So, I guess they aren't truly "reef-safe" since they do eat/nibble on those inverts, but other than that, never even looked at corals.