It should be noted that sun polyps and carnation corals are both non photosynthetic, low light, low water flow corals. They usually require deep caves with slow circulation to really thrive, and it helps to take a jar with food in it, invert it over them, and then shake it gently so that the food can float around and be eaten. This method was recommended by Anthony Calfo, and I found it to be very effective. It keeps you from fouling your entire tank with constant feeding, and it certainly benefited the non photosynthetic corals. Another possiblilty, if you're bent on carnations or non photosynthetic gorgonians (which I am) is to make a phytoplankton reactor, and have a constant slow drip of phyto in your tank. This as well as the addition of rotifers, freshly hatched artemia, and cyclopz-eeze (sp?) will greatly benefit all your corals and clams. Carnations growing upside down in a cave are just too cool. Colt corals are much more practical to most people though. Carnations usually don't live much longer than a year in a normal reef tank. Sun Corals though, are a bit hardier, and if fed meaty foods (which isn't such an option for carnations with their smaller polyps) it will positively thrive and bud like crazy.
Those yellow polyps are a menace! I had some, they spread worse than the green star polyps, and not nearly as pretty. But as a test the waters coral, they can't be beat. If you can't get those to thrive, you've got serious water issues.
Only thing more dangerous than a 2nd lieutenant saying "In my experience" is a warrant officer saying "Hey guys, check this out!"