I have one of these in pink. I got it at Fish Ranch II a few years ago, sold as a Blastomussa. It was on an epoxy rock of three different corals, all sold as blastomussa. I knew it wasn't a blasto, but until now could never find what it actually was. I wish I had a camera so that I could post my own picture, but anyone who came to one of the frag swaps at my house has seen it.
Mine is a gorgeous pink, and altogether it is about 4" in diameter with about 8 - 10 heads. It looks similar to, but better than one of the previous pics...
Jim
p.s. The fish staring out at you in the original pic appears to be a Centropyge argi (pygmy angelfish)