It depends on the corals you are feeding. Mine get feed with the rest of the tank. I do feed DT's live plankton and Liquid Life Marine Plankton and Coral Plankton twice a week. If you feed a good froozen food high in protein like krill or mysis, most corals will do just fine as long as they have enough light.
Some people are like slinkies...they serve no real purpose yet can still bring a smile to your face when you push them down the stairs!:p
Have a great day! Brian