I posted this on Reef 2 Reef as well. Maybe the SPSers here will be able to help make sense of it....
Thats an odd one. Id like to say encrusting monti, but the polyps boggle me. They appear too large for montipora polyps, not the correct formation as well. The closest thing I can think of is pagoda but I can hardly agree with that. It just looks similar on the polyps