can I get an ID

[trueblackpercula]

I have had this for a wile and it is doing very well. Its more purple in person and has white poylps. YEA YEA I know PM look a like but what is it?
Thanks
Michael
http://reefcentral.com/gallery/data/500/42064RIMG0025.JPG

[danfrith]

Acropora granulosa

[trottman]

those grow fast