Highfin blenny, Petroscirtes mitratus

Also known as Coral Blenny, Crested Sabretooth, Crested Sabretooth Blenny, Fang Blenny, Floral Blenny, Floral Fangblenny, Helmeted Blenny, Highfin Fangblenny, Highfin Sabretooth Blenny, High-finned Blenny, Miter Blenny, Sabretooth Blenny, Sabre-toothed Blenny.

Found singly, or in small schools, in coastal waters, over shallow protected estuaries, lagoons, and reef flats, rich in algae and seagrass. When nesting they use empty mollusc shells.
They feed on filamentous algae and weeds.
Length - 8.5cm
Depth - 0-8m
Widespread Indo-Pacific

Combtooth Blennies are the largest family of blennies, found in both tropical and subtropical waters and freshwater habitats, as the name suggests they have comb like teeth lining their jaws, well suited for scraping food off hard surfaces!
They will then dart back into their holes out of harm's way.