Need an ID

Well I picked this very nice frag up from the guys at Tranquil Scape. Its a very nice piece. This pic is after about 4 days after I mounted it. Its purple with light purple polyps. Any idea of what it is?
 
Thank you. I didn't know the name of this one. I'm going to put it mid level in the tank, since it is thick like a tree trunk. it has been growing pretty good thus far and the polyp extension is great as in all the SPS's that I have.
 
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