Magnificent Sea Anemone (Heteractis magnifica)

This is one of the most beautiful of the several large tropical anemones that harbor colorful clownfishes. It ranges widely throughout Southeast Asia and the Indo-Pacific region, typically attaching to rocky bottoms in a prominent position exposed to strong currents. Its crown or "oral disc" is equipped with abundant, finger-like tentacles. The column (outer wall) is variable in color the most spectacular individuals are blue, purple, or bright red, but less striking shades of pink and orange are frequently evident. Close inspection reveals that the column has longitudinal rows of raised "warts". The oral disc of large adults may measure as much as 1m (3ft) across. Invariably, it is associated with a "family" of symbiotic anemonefishs belonging to the genus Amphiprion. At least 12 species of anemonefish  and one species of damselfish are known to live among its tentacles. The fishes  use the anemone as a refuge form predators, which unlike the symbionts are stung by the tentacles.