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This wrasse has fleshy lips, a single row of conical shaped teeth, and a small eye.
Like most wrasse, it is known to change sex (from female to male).
This wrasse is very common and is found in a variety of habitats.
If needed, a moon wrasse may dig out a space under a rock by repeatedly swimming through it until it fits without struggle.
Some fish regularly clean others, and wrasse and shrimp appear to specialise in this regard, as do remora, which permanently hang on to their hosts.
So lizardfish visit the cleaner wrasse, which clean the parasites from the skin, gills and mouth.
It has also been found in green algae, bacteria, crustaceans, and fish such as carp, golden mullet, seabream and trush wrasse.
They use the seamount as a cleaning station for wrasse to remove parasites from their skin and clean their gills and mouths.
Some wrasse species are aggressive towards small fish and invertebrates, others are reef safe.
In this behaviour cleaner shrimps resemble cleaner fish, and sometimes actually may be seen to join cleaner wrasse and other cleaner fish attending to client fishes.
They are protogynous hermaphrodites, all starting off as females and changing to males, a process which, for the moon wrasse, takes only 10 days.