Sea Anemone do not have a regular closed cardiovascular system, but they do have a central gastro-vascular system just like many other Cnidarians, such as coral. Sea Anemone, use their tentacles to catch and shock organisms as they pick it up for consumption. Sea Anemone mostly feed on other organisms, and like coral, they provide protection for smaller algae and fish. This relationship is mutual, because in the example of a fish, the Anemone gives protection to the fish, while the fish quickens the flow of oxygen rich water into the anemone, allowing it to gain essential gases need to live.