Generally carnations do poorly in captivity due to their requirements to feed and for pure stable water with lots of movement, partcularly upwelling swells and linear flows, not tubulent waves like we try to give our stoney corals. There are times when they give off substances that are toxic to sps. When they are stressed, such as first placed into the tank, and when they are degrading or dropping spicules. Montiporas are particularly alergic to carnations. This is not to say that carnations are impossible as I've seen a couple live, but, generally they don't make it for long. If you can get them to do well and have the foods for them, then you are very fortunate. I would recommend that folks leave them in the ocean unless they are marine biologists with a study going on. Either that or get some that are tank raised from Garf and follow their instructions explicitly to keep them. Try keeping them in a specialized tank to get a handle on it before placing them in a mixed tank. They are beautiful but its not worth loosing your other things over.