Clownfish live in wide ranges of the warm waters of the Pacific and Indian Oceans. Some species ranges overlap others. Clownfish do not live in the Atlantic Ocean. Clownfish live in a symbiotic relationship with sea anemones, or in some cases settle in some varieties of soft corals, or large polypy stony corals. Once an anemone or coral has been adopted, the fish will defend it.

 Sea cucumbers are scavengers, feeding on debris in the benthic layer. Their food consists of plankton and other organic matter found on the seabed. One way they might get a supply of food is to place themselves in a current where they can grab food that flows by with their tentacles when they open. Also they sift through the bottom sediments using their tentacles. They can be found in large numbers beneath fish farms.

Parrotfishes are named for their oral dentition: their many teeth are arranged in a tightly packed mosaic on the external surface of the jaw bones. This forms a parrot-like beak which is used to scrape algae from coral and other rocky substrates.

Brain coral – they use their tentacles to catch food during the day. At night, the brain corals use tentacles for protection by wrapping them over the grooves on their surface.