read that link....dont know where they get the orange shoulder is aggressive from?? ....mine doesn't even give anything in my tank a second look.....the cleaner wrasse is his constant companion....the only thing he does is nudges the yellow tang away when it trys its luck.....but certainly no aggression of any kind.....when the lights go off my cleaner shrimps crawl all over him without any problems......i would recomend this fish to anyone with a big enough tank with plenty swimming space..cause these are a big fish...but have a big personality to go with it and not to forget a beautiful tang into the bargain.