| if it is feathery, and very tiny, it could be bryopsis. If it is feathery, and a larger (macro) algae, it is could be caulerpa taxifolia.
I'm not sure about any one stop source for ID of this kind of thing.. but Renee (SeahorseDreams) is putting some kind of a "What-s-it" post together. Maybe she'll chime in here.
Dave
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