I feed my corals twice per week at midnight, first i turn off pumps then blow a little brine on sun coral to coax it out. I then feed all my other corals with one hand whilst fending of cleaner shrimps with the other..lol..by the time all the others are fed the sun is open and ready to chow, i then using a turkey baster spot feed the coral, i cant say i get all the polyps as new ones seem to grow every week, keeps getting bigger. I believe that keeping the sun coral in a strong flow is way more important than keeping it out of light. Yes it is true that they are not photosynthetic (spell check) but direct light will not hurt them. Putting them in a cave or under an overhang usually means a low flow area which is a big no-no. Also they need to be out of the sand.