Have you tried it with any of your corals. I have been trying them for about 3 years now and I have found them to leave most corals alone if you get them as juveniles and feed them well. I have one that is about 6+ that I raised from juvenile. He is in a 375 gallon full of soft corals, anemones, clams, and zoanthids. My newest one is here at the shop in a sps tank and is behaving well. What a great fish they are.