I recently bought some live rock from a friend that was breaking down their tank, I've had it for a few weeks, and just this morning noticed that I'm an unsuspecting owner of a a small, 1&1/2" yellow wrasse, it seems to only come out when the actinics are on, and stays hidden when the halide comes on, could this little bugger be problematic when he gets bigger?, it would be quite difficult to try and remove him.