I feed corals 1-2X a week. Other than that I just let the fish feed them with their secretions (poo poo and pee pee).
That being said, corals can still make their own food through endosymbiotic photosynthetic bacteria and algae (english = microscopic organisms that turn light energy into sugar). Feeding only supplements "essential nutrients" or nutrients the coral itself cannot produce. I look at coral feeding as giving corals a multivitamin every once and a while to help boost coloration, growth velocity, and all around health.
I do not claim to be a Ph.D. in marine biology, so these opinions are just that... opinions based on a science background. Take them or leave them.
Good luck, and your vols are going to be CRUSHED on saturday.
p.s.--> Reef chili, reef snow, DTs, frozen rotifers and brine shrimp work for me.