I got this from my lfs but they weren’t sure what it was. I thought it was a montipora spong., but it looks like it’s growing coralites that look very acropora-like. The picture doesn’t do it justice but it is VERY yellow with maroon looking polyps. I looked at it last night and I saw acro-like tentacles coming out of the tips of the two prominent coralites. The bottom frag is a PC Rainbow.