Pictured in the bottom left of the image are several soft coral polyps (class Octocorallia). Soft corals have eight feathery tentacles which is why they are also known as octocorals.

    Photographed by Suzan Meldonian while SCUBA diving at the Blue Heron Bridge just north of Peanut Island, Lake Worth Lagoon, Palm Beach County, Florida, 5/1/2011. Images copyright 2011 by Suzan Meldonian.