How bad does he destroy the colony? Does he just tear the polyps off or what?Then you have to make a choice .... get rid of it or live with the consequences. I have a lemonpeel in my reef tank. Most reefers would shudder at the thought of having one, but it's one of my absolutely favorite fish. Every now and then it destroys a colony of SPS (usually one of the more 'valuable' ones) but I put up with it.