The problems Coris wrasses have in Reef Tanks have to do with the diet and hunting behavior. Coris wrasses flip pieces of rubble or coral over to expose concealed prety items, which can cause damage to coral polyps. Subadult and adult Coris wrasses are also predators of snails, small clams, tube worms, ornamental crustacteans, sea stars, sea urchins, and sea cucumbers. So, I would strongly advise against a Coris wrasse because of the feather dusters.