Just like anything else live in your tank, it is important to feed your coral. Research the nutritional and dietary needs of your aquarium coral. In their natural habitat, corals eat plankton. Feeding corals will often accelerate their growth. But just as with fish, it is possible to over feed corals. You must keep in mind, what goes in, must come out. In addition to photosynthesis, most coral need to eat additional food directly from their environment. All corals rely on photosynthesis for part of their nutritional needs. An aquarium light with a timer will allow your coral to feed itself.
Corals cannot survive alone on photosynthesis. Offer your corals with a variety of plankton for better overall health. There are many species of plankton, but the most important ones to supplement in your marine aquarium are phytoplankton and zooplankton. Phytoplankton are plant-based and very tiny, and are preferred by filter-feeding corals that have feathery-like appendages or gills. Feather duster worms and SPS corals with small polyps require this nutrition for survival and growth. Zooplankton represent the animal portion of the plankton group. They are much larger in size than phytoplankton. Corals that feed on zooplankton typically have larger polyps that do not resemble feathers. Invertebrates that feed on zooplankton in the wild include: soft corals, zoanthids, mushroom corals, large polyp gorgonians, anemones, and many species of crustaceans including shrimp, crabs, and lobsters. Phytoplankton should be offered during the day, and zooplankton during the night.