I'm with ReefRunner on the skunk (lysimata) cleaner shrimp. They will boldly approach fish and will even pick up little fish to groom as well as jump onto big fish like tangs to get the job done. They'll even groom you if you stick a hand near them. They work well together, too. You can put two or more together. I used to only have one per tank but found out they are more effective in pairs. They come out more and set up an all day fish cleaning station rather than just grooming at night as the solitary ones seem to do.