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The moment I spotted it, I did a double take...Opuntia cactus underwater!!! This flat handfan-shaped green structure looks a lot like the Opuntia cactus. This is a macro-alga (I read it up!!!) According to one report: http://www.wildsingapore.com/wildfacts/p... " These seaweeds can relocate their chlorophyll. At night, chlorophyll might be concentrated in the centre of the segment. As a result, the seaweed may appear white."I spotted it during the day; no wonder it was green.
Growing attached to rocks that were exposed when the tide went out.
Great info plus photo: http://reefkeeping.com/issues/2004-04/nf...