I have a BIG coral banded, and she's a very well behaved girl. Despite being just about the largest thing in the tank (if you take her claws into account), she's very shy. I rarely spot feed her, but she never bothers a thing and moults regularly so I know she's getting enough to eat. I don't know if some of us just get lucky, but I'm always surprised to see posts where someone has issues with a CBS - IME they're very shy creatures that stick to themselves and are far less bothersome in a reef (from a hungry coral's point of view, as well as some fish) than skunk cleaners.