Black Margate

Found singly or in small schools, during the day close to the shelter of caves, ledges, and wrecks, dispersing at night hunting for food, over sloping rocky bottoms, of larger patch reefs.
They feed nocturnally on crustaceans, smaller fish, molluscs, and long-spined sea urchins.

In some areas of the world 'Grunts' are better known as 'Sweetlips' distinguished from other species by their very large rubbery lips.
'Grunts'because they "grunt," the grunting sound is produced by their flat teeth plates rubbing together and this is amplified by their air bladders.
Found either singly or in schools hovering or motionless over the reef during the day, becoming nocturnal predators.