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Many species of shrimps act as cleaners. This is a Leandrites sp. at work on the mouth of a coral grouper, Cephalopholis miniata.

The charming little boxer crab, Lybia tesselata. The boxer crab clutches two tiny sea anemones, which it uses for defense, and even to immobilize small prey. The sea anemones (Triactis producta) are so important to this crab that the only time it releases them is when it sheds its integument. And then, observers say, it seems very nervous until it picks them up again. You easily can find these crabs under coral rocks on the drop-off at Tulamben, Bali from about 3-12 meters depth. Take care not to break up living corals, however. Ambon, Maluku.

Food filtered from the current by the fine hairs on the crinoid's arms are passed down a channel to the central mouth. Crinoids sit "upside-down" compared to the starfish, and the mouth is on top the animal.

Some feather stars are nocturnal and hide by day in reef crevices. As night falls they come out of hiding and climb up onto prominent blocks of coral or other high points where they are exposed to the strongest current flow. Crinoids are particularly abundant in plankton-rich areas.