Doctorfish

Found singly or in loose schools, over shallow areas, of coral and rocky reefs. Can change colour dramatically, from dark to light.
Juveniles found helping out at cleaning stations along with other fish.

Surgeonfish have a blade like spine in the tail that points outwards when bent, unicorns have two hook-like plates along the tail, these are used for defence and are as sharp as a surgeons scalpel, hence the name "Surgeonfish".
Some species are venomous.

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