Wrasses in the Thalassoma genus are not appropriate for reef tanks with shrimp, crabs, snails, urchins, etc. They are also very active, eratic swimmers and can agitate other less active and smaller fish and can even prey on small fish. I don't believe they would bother corals. It's too bad because they are beautiful fish with personality and intelligence. They do great in fish only systems with the right tankmates. Feed them meaty foods such as krill, Formula I, small silversides, etc. I kept a paddlefin and Klunzingers. Both were beautiful fish, adapted easily, and really livened up the tank.