I have heard and read that angels can nip at SPS. Nip at is different from eating the coral up. Do butterflies actually eat SPS up? what happens to the SPS when they are nipped at? do they die? The only fish that i know of that has evolved to Actually eat the actual coral is the parrot fish. and thanks to them eating the corals we get lovely arognite. IS nipping really so bad for sps that they die from it? I have read that they eat the slime thats produced and at times the coral actually colours up better. Your experiences?