Well, it is not in the millipora group, as the corallites are not touching. It has a strange growth form, as if it has not grown under the same conditions in the last year. Reminds me of A. tenuis, but the corallites are a bit too shallow in form and the axials seem too short. maybe A. verweyi, but I've never heard of it being anything but beige and pink.
Very cool coral. Congrats on snapping up a real beauty!