My friend has all my books and I've had trouble finding a good, easy site to navigate with lots of coral pics. I'm sure this is a more common SPS as our LFS had several.
Hydno, I have the same kind, It was sold to me a s a "bushy hydno" It was about the size of yours is and now after 3 months it has doubled in size and is a big Bush. I have fragged it easily and it also fragged itself. I found a small polyp in the sand. I can also see what I believe to be calcium deposits within the tissue separate from the main skeleton. I guess this is one way that they will propagate themselves. Just spitting out little pieces of skeleton with polyps attached.