There is a fully grown one in a good size cylindrical tank at a restaurant near me (tank is probably 1000 gallons). All it does is swim in one direction as fast as it can, round and round. It is in there with a Clown Tang, Sohal Tang, huge Porcupine Puffer, and some other fairly aggressive fish. All other fish seem "normal" though. I do think psycho applies here towards the Clown Trigger.