I have one as well, he's been in the tank for about a year, gone from 1" to at least 5" maybe 6". We have a love/hate relationship, I love that he keeps the bristle worm population down as well as the asterina stars, I haven't seen a amphipod in months but he attacks and kills my snails, killed my crabs and shrimp, picks at the clam, pulls zoas from the rock and harasses powder blue (once was the king of the tank), every time my clowns lay eggs he treats himself to a free meal

. I have tried to catch this guy and wouldn't mind if he carpet surfed but unless I drain the tank or trap him somehow he's in the tank for the long haul...