Striped Poison-fang Blenny Mimic

Found singly or in pairs, over sand and weedy areas, of coastal and lagoon reefs, nesting and sheltering in bottles, abandoned shells and worm tubes.
They feed on algae, crustaceans, mucus and fins of fish, benthic invertebrates, and zooplankton, and will also nip divers.

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!
Sabretooth Blennies have teeth to match their name!
They can be seen darting forward to sever flesh from fishes fins. (can sometimes be seen taking a swipe at divers as well) They will then dart back into their holes out of harm's way.
Some blennies will mimic cleaner wrasses to get close enough for a nip at fish.
A few Sabretooth Blennies are venomous.