Here are two colonies, pink and purple, of California Hydrocoral--they are not anthozoan 'true' corals. These colonies were at 18 m depth, but the species extends into deep water. The colonies have separate sexes, they are slow-growing, and these could be 100 years old.
Here Corynactis is completing the slow act of pulling itself apart to form two clone mates. Corynactis also can reproduce sexually creating variation in color and other traits. The topsnail, Calliostoma, is one the anemone's few predators. Depth 15 m.
Under attack by the leather star, Corynactis defends itself by extruding its mesenterial filaments loaded with stinging cells, nematocysts, from its body cavity. Depth 27 m.