I have a 30gal with 2x96w PC. For the sun coral you dont need much light. Actualy I believe they will come out more with less light. I feed 3x a week. I was feeding daily but I started getting hair algae everywhere. I may kick back up to every other day. The sun coral does not need light to thrive. They are nonphoto,,,,(sp). You must feed every polyp. I cut the bottom of a bottle and feed through the top.
I have 3-4 inches of arag sand.