Those Crystal look a hell of a lot like Heart Of Atlantis Zoas/Blue Shuriken Zoas. They look really purple in the pics but mine are more purple.
http://www.zoaid.com/index.php?modul...g2_itemId=9308
I got a small frag from frag-a-lot a while back and I have only 2 small polyps.
For some reason they have never taken off.