I'm not sure if you ever resolved you algae questions, but this is my guess.
Padina sp. Also known as Scroll Algae, a calcium carbonate encrusting Brown Algae. I had to patches of this that grew out very nicly. After trying to crop it back it would not grow any more.
There is an excellent little field reference for Caribbean species of macro algaes avail
the Authors are Littler and Littler.. do a search at bestbookbuys.com to find one avail.. i got mine for under 15$
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