I dunno, to me, they're coral-safe. I have a miniatus grouper in our display reef at the store. No problems. Just keep in mind they'll probably eat shrimp and will most definitely eat small fish. They also get huge (but really, no bigger than most tangs... LOL!).

With it being a grouper,its likely to be a fish eater,as far as I know the Marine Betta is the only one in the family that is reasonably safe around small fish.Im just basing this on what I know of groupers as a whole and not on this species.

finally got that polleni i see. lucky bastard