The whitespot myth
While they are excellent at removing dead skin and picking off isopods, flukes and various other ectoparasites, it’s a misconception that a cleaner wrasse can keep a tank whitespot-free. The feeding stages of Cryptocaryon irritans actually burrow into the host fish’s skin, making them difficult for the wrasse to consume. Not only that, cleaner wrasses are unable to deal with the microscopic free-swimming infective stage of this parasite, making them useless against reinfection. In short, if you’re eyeing up a cleaner wrasse as a form of natural whitespot control, forget it.