Punctatum Sweetlips

Found singly, or in schools during the day, often in murky waters, close to debris, rocky outcrops, and wrecks, dispersing at night hunting for food, over open waters of bays, estuaries, and coastal coral reefs.

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.