An animal
A Blue Whale eats krill. Which is a shrimp like marine animal.
coral beauty
it eats coral, bacteria, fish and mussels
Yes, some fish feed on coral polyps. These fish are known as corallivores and they can cause damage to coral reefs if their populations are not kept in check. Examples of corallivorous fish include certain butterflyfish, parrotfish, and angelfish.
fishers, and occasionally hawks and some snakes
fish
The main thing living there is the coral. The coral is a living organism. There are also many tropical fish and sea turtles and there is even a starfish that eats the coral.
Perhaps you're having a hard time with this because you're not sure what a primary consumer is. A primary consumer is an animal that eats only plants (an herbivore). So I would guess that any animal (like a fish) that eats the coral would be a good example.
neither it is an organism
A piscivore eats fish.
Many of the fish (butterfly's, angels, wrasse, and many others) eat the coral. There are also numerous invertibrates that eat the coral, a few examples are the crown of thorns starfish, and many many kinds of nudibranch(sea slugs).
a sea otter swims around and eats fish and coral