The tan colored coral with purple tips and green polyps is an Acropora valida. This was sold by Steve Tyree, and was labeled a "limited edition" coral. I decided I had to have a frag of it when he came to town to speak to our club. Due to higher Phosphate levels in my tank, a lot of my SPS had died. Some of it survived, and over time grew into a lovelly colony.
The coral in the foreground had its tissue eaten away by a Clown Goby!! Needless to say, SPS can be more than just challenging; they can be heart-wrenching.