mine hasn't nipped at any of my corals so far *knock on wood* . looking thru my rock work and pecking at it and eating all my small hoard of feather dusters. But it seems hes almost done with em all.
I been feeding blood worms and mysis but my other fish are much more aggressive and eat everything before he gets a chance to get any from what i can tell.
I almost feel like its only a matter of time before hes forced to nip at coral.