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There are lots of these pie-plate sized white discs on the bottom. If you turn one over, many are white on the bottom, too. Some have green accents, and some have purple ones. If you're lucky, you can find one with both.

This stuff has the same name as the white anemone-looking animal. Can they really be the same? They are indeed; the inner ends of the hard protuberances (lime-green in this picture) are the ends of the tentacles.

Nikon F4, 105mm Macro lens, Aquatica Housing, 2 Ikelite AI/n strobes, f/16, Fuji Reala.