I've heard of them "picking" at corals but not of them actually doing any damage. Mine would on occasion taste a polyp but never broke the skin so to speak.
Originally Posted by shogun323
I had one that nipped at my trumpet corals as well as my feather dusters. It seems it is really hit or miss with them.
Was there any physical damage done?
Originally Posted by xDave
Was there any physical damage done?
Nope, but the feather dusters stopped coming out. They never broke the skin. They just caused irritation (to the feather Dusters that is)