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Cleaning organisms including shrimp and fish can congregate in one location on a reef in what is called a "cleaning station" which fish will visit when required; cleaning shrimp perform a rocking dance from side to side to signal their services when fish approach.
These two small wrasses are cleaner fish, which eat parasites off other fish. Cleaning station: A reef manta ray at a cleaning station, maintaining a near stationary position atop a coral patch for several minutes while being cleaned by cleaner fishes. Doctor fish: Doctor fish nibbling on the diseased skin of patients.