Hi Guy,
Sorry, I can't make out enough details of that algae to guess at its species.
I am assuming that your system maintains low nutrients levels and would suggest those frondose algae species that are found further out from shore. Such algae require low nutrient levels unlike those found near shore that recieve a lot of run off (hair algae and such). Oh, and stay away from using the Caulerpa species, they are horrible for use in an enclosed system. The following link shows a great many species that would be of use although as I said, any of the macro algae covered rocks found further out should contain a nice mixture of species that are suitable for lower nutrient levels.
Wish I could just throw a list of algae at you, but there are just far too many, and far too many found here in the Philippines for me to list all of the possible choices. Any of the branching and "leafy" types should be just fine. Of course, avoid the known pest species (bubble, hair and caulerpa)
http://www.surialink.com/HANDBOOK/
http://www.saltcorner.com/sections/gues ... aepage.htm
Chuck