This is actually a Stereonepthya Specie.. (this is not a carnation coral) From my experiences they are fairly easy to keep. I have 4 different colors of this perticular coral you have. They do best under halides, and a strong turbulent flow (nothing direct). They can thrive under any lighting but seem to gain there strongest coloration from halides. Dont be alarmed if you see your coral droop over and look unhealthy. I havent figured it out yet but they do this, then a few hours later they look as healthy as can be.
Hope this helps. Any questions just ask.
KEN