Ever seen one of these? It's about 8 - 10 inches across, ssen in 25 ft of water.
It is a type of corallimorph. Sometimes commonly called mushroom anemones. Hard for me to tell exactly which species.
National Aquarium in Washington, D.C.
REEF Board of Trustees
Would a better picture help? I can send you a hi-res version. Park
REEF Headquarters | P.O. Box 370246 | 98300 Overseas Hwy | Key Largo, FL 33037 | USA Phone: 305-852-0030 | Fax: 305-852-0301 | email: REEFHQ@REEF.org