We bought a cleaner wrasse to put in with a powder blue tang that got ich. It was cleaning a juv. angel at the LFS before we bought it. The wrasse went right to the tang and started picking away. We thought , cool. Kept watching, and the wrasse bit bloody spots in the tang(Tang decided it was time to kill the wrasse). overnight it ate a pretty good sized chunk out of the tangs face, where the ich was. Took it back to LFS, who couldn't believe it. And to prove it wasn't one of the false cleaners, he acclimated the fish, and put it back in with some of his fish. It cleaned away, no problems. Kooky, huh? I don't think I'd buy another, they never leave the other fish alone. Just my 2 cents,
B