Ethereal Sea Fan (Gorgonia)

Photo copyright Tim Nicholson.
Taken on Big Brother in the Egyptian Red Sea.
Sea fan.

Sea fans are gorgonian corals. They grow at right angles to the prevaling current, their tentacles straining microscopic particles of food from the water.

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Further Reading
The Underwater Photographer: Digital and Traditional Techniques, by Martin Edge, Paperback, 536 pages (2009)