This gorgeous coral is called a Diploastrea. There is some debate whether it is in the SPS or the LPS family, because it acts a little like both types. All day long, it appears as above. And at night when the lights are out, each tip opens up and extends short tentacles for feeding. I picked up this coral locally, and was very surprised to discover it had grabbed onto the rockwork beneath it within just a few days of being added to my reef. I thought it needed to be repositioned slightly, but it was already well attached.