Yikes, Coris Wrasses... The scourge of every invertebrate and small coral frag. Coris Wrasses get pretty big, usually too big for nano tanks, and WILL kill hermits, snails, small crustaceans, small inverts, and some others. They also have a nasty habit of taking small bits of rubble or even small coral frags in their mouths and literally throwing them around the tank looking for food. If it's in a Fish Only, great, but they become nuisances in tanks with LR/inverts/corals