Some consumers in the Great Barrier Reef include:about 1500 species of fish, such as barracudas, mackerel, angel fish, butterfly fish, clownfish, groupers, codTurtlesDolphinsDugong
Some of the largest include the groupers, and the giant hump head wrasse. Sharks are also fish, so really the largest fish on the reef are sharks, but most are not permanantly on the reef.
I think you are thinking of Groupers.
Sea anenomes, Coral, Clown fish, eels such as the Moray, Groupers (AKA Sea Bass), and Reef sharks live in the coral reef zone.
the only one I know is Mullusks. the eat seaweed, coral, small fish, and other mullusks.
Depends on the size of the grouper, and species. Reef grouper or giant grouper. Reef groupers are eaten by larger fish like sharks, eels, and rays. Giant grouper can grow to 8 feet and they are eaten by sharks.
There are many fish species that live on coral reefs. The Greater Caribbean region alone there are 500-600 species of coral reef fish recognized, other areas are even higher. Some coral reef fish are Parrotfishes, Surgeonfishes, Rabbitfishes, Dameslfishes, Open Water Plankton Feeders, Benthic Planktivores, Nocturnal Planktivores, Butterflyfishes, Triggerfishes, Grunts, Snappers, Pursuing Predator Fish, Stalking Predator Fish, and Ambush Predator Fish.
Coral
Krill
mollusks, and small fish
fish and small reef sharks
yes they do, they also eat squid and small reef fish.