Just looked up galaxia corals, it could be one of those,
This pic:
http://www.ratemyfishtank.com/photo-main.php/4154 looks like a lighter coloured version of mine, with waaaaay more polyps, and if I **** it off and it retracts, the individual polyps look kind of like this:
http://reef.pantshead.com/?p=326
From the reading I've done it looks like I might not have moved the stuff I rescued from it far enough away.
crazy. This is all growing on a tiny piece of rock that was used as a base for another colony. An SPS (which I have yet to identify) started as a single polyp and is now a very mini colony, and then this thing started growing. There's another cluster of polyps on the other side of the rock too. The tank it came from must have been a very happy place to have so much spawning going on.