Photosynthetic corals do not need special food if the aquarium system has live rock and/or live sand. These animals receive most of their food from the symbiotic algae and the rest is from plankton. If you feed your tank, the anemone will catch some of this food as well.

The extra food will lead to long term pollution problems.

But before the arguments start, I do know that some people know more of what is best for our ornamental animals than 4.6 billion years of evolutionary adaptations.