It actually looks like it's the Condylactus above. My wife thought that it would be a good present to come home with since my tank needs new occupants. It crashed due to a faulty heater about 3 months ago, and I've gotten it back into shape, but there's nothing but a Percula and a Yellowtail Damsel (the standard original). There's a couple of polyps that are starting to make a comeback but that's it. Water parameters are really good. It's a pretty mature tank that has never had problems. I have a skimmer and a cannister filter and that gives a good amount of water movement, and everything stays very stable. 15-20% water changes religiously every weekend, and it gets topped off everyday and tested about every 2 days. The only inhabitants that I've lost ever are due to the heater. So water is pretty good.