I have never had a problem with my CB picking at any corals. Once in a while I will catch it picking at the rock that my glove polyps are on, and this looks like it is picking at the coral, but it is the rock the fish is after. Other than that I agree that if you give the fish adequate rockwork to swim in and out of, as well as a variety of foods it is a fairly reef safe fish (this is just in my experience, of course).