As a start, would dosing reef roids for the corals help in upping the nutrients in the tank ie. Nitrates and Phosphates?
It will add carbon, nitrogen and phosphorus. Best thing though is to feed your fish more. The ammonia and urea from the fish is ideal sources of nitrogen and phosphorus for corals and fish poop is a significant part of the carbon cycle. Feeding corals prepared foods is problematic as corals have very species specific responses and what benefits one species harms another species and a third species may be indifferent.