Nurse shark
The Nurse shark is a nocturnal predator, and hunts alone.  They feed on fish (such as catfish, mullets, and pufferfish)  stingrays, mollusks (such as octopuses, squids, and clams),  sea snakes, and tunicates. They move very slowly as they hunt along the bottom. They also consume algae, coral,  crustaceans (such as lobsters, shrimps, and crabs), sea urchins, snails and bivalves.