I am afraid of that. Guess that will be my trial and error. Were you feeding yours with frozen food? I read that you can chance it and keep them on all frozen and maybe...maybe they will leave the rest alone. If not, he will have to go. I just hope I get lucky on this one.
I fed frozen shrimp, and some regular store bought, it could have been my fault also, as I added hime to my reef and cut back on the feeding do to bio load for the corals.