Beautiful fish. I had one for 2 years, then I noticed him nipping and killing some corals. I always wondered why all my green zoas had just disappeared. After I added a pocclapora frag and xenia he was relentless in nipping and killing them. I tried covering them, but he would find his way into the cover and munch, munch, munch. Turns out it was him that killed them. So, finally I removed him. The corals have all looked much better. Good luck, they are awesome fish.