hydnophora rigida, Very aggresive coral so be carefull not to have it too close to other sps as it will attack with its' sweepers that can extend a good 2-3 inches. Once it tags a coral it will look like a big spider web between the two while it is eating the less aggressive piece. Very easy coral to care for though. Lighting for them can range from PC, T5, MH, VHO, etc.
Good luck.