I have two sun corals, one yellow and one orange, had them for almost two years. They must be fed as they are not photosynthetic (well, technically no coral is I guess), usually a few times a week. It's not too difficult to take care of, just keep it fed. I don't try to entice mine to feed, I wait until late at night when the polyps open and feed cyclopeeze, mysis, plankton, squid, krill, anything that fits in their mouth. They grow like crazy if you feed them. Really cool corals, I want a black one so badly.