Thanks for the picture comment. Only the the Clown Knife(aka Butcher) eats goldfish. He also eats the pellet foods I feed the sharks. The 2 ID's are eating algae tablets and nutrifin pellets. I raised tadpoles in my tank with the big ID and he never ate the tads or the little frogs. They looked like divers swimming with a large whaleshark in the ocean. I heard that Imperial have teeth, not finding out the hard way. Anybody confirm that?