I'd go with valida, also. I've got a larger colony that is very similar from garf. I've got nana (also from garf), too, and there are some growth/coralite differences. They are growing in the same part of the tank, too (lighting, current, etc.).
Nana and validas are very very close in appearance. If you get a macro shot we might be able to be more accurate but otherwise from what I see I still think valida.
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