I just saw Acropora vermiculata- UC “Super Blue†Aussie Vermiculata discussed by Unique Corals. I think it's that just in need of rehabilitation. Hopefully I can get it colored up.
There are a lot of Acropora that could start off looking like this. A. vermiculata could be one out of 50 that get those rosette style radial corallites. If it ends up growing like a stag or dense bush then it's not A. vermiculata. It's going to need time to grow out some more before it can be narrowed down.