Also known as Blue-eye Bristletooth, Blue-eye Surgeonfish, Blue-eye Tang, Doctorfish, Lancetfish, Thorntail, Thorntail Fish, Twospot Bristletooth Surgeonfish, Twospot Bristletooth Tang, Twospot Surgeonfish, Twospot Tang.
Found singly grazing on the surface of algae covered coral and rubble areas of deep lagoons and seaward reefs.
They feed on algae and detritus.
Varies in colour with light.
Length - 22cm
Depth - 2-50m
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. Ref: https://www.fishbase.se/summary/6012