The cleaner wrasse, with a reputation for being difficult to acclimatize, lives
in couples as an adult. It feeds on live prey and it has a highly distinctive habit:
it "cleans" other fish. It puts on a show in a specific part of the tank to attract
them, and it then frees them of their external parasites or pieces of dead skin.
When there are no males available, a female can change sex. Size: 10 cm.