I use plankton once a week and thats for my sponge. The only corals that I feed are my bubble coral, 4 brain corals, and my sun coral, and thats only once a week by target feeding. I use a half of cube of frozen shrimp. I feed my fish flakes every other day, and my corals will also catch some flakes. I would cut back on the feedings. I think Matt has a tank with just coral. Maybe he'll post on how he feeds his.