That is one of my favorite fish, see my avitar, and I have kept them in reefs many times. None of mine bothered corals, but they will destroy any worms you have, feather dusters, coco worms, or any ornamental worm will be history, they will also bother shrimp, I have not had trouble with cleaner type shrimp, but even big non cleaner type shrimp are fair game and if they can't eat it whole they will either wait until it sheds and is soft or bash it against the LR until it breaks up into small pieces. On that note, they are still one of my favorite fish and I highly recomend them.