ok so a fellow reefer and I where talking about fish. And he really wants butterfly fish and I want a a red Coris wrasse. The question is. Why do reef tanks need clean up crews and fish only don't. It seems that most people with fish only tanks have fish that will destroy a clean up crew. We both like mixed reefs with different types of coral and fish. Or what are people doing in place of clean up crew? If I have to except I can not have said fishes in reef tank it's ok. Just want to better understand how other people are doing it. Thanks