As for Sun coral. They are very easy to keep if you feed them. They are not photosynthetic.
I have both an orange and a black and I never target feed them. They just eat food that gets blown into them. Both are growing well. Interestingly, in Eric Borneman's book, he says that the Black Sun coral has one of the densest skeletons of all corals. He says that they are 1 of the few corals that can withstand typhoons and nuclear testings. LOL. Well, that explains why I couldn't frag the thing. I tried fragging my black sun coral with pliers and steel cutters. I couldn't do it, hurt my hand, and gave up. I didn't try the hammer yet.
