I feed one time a day to lesson the excess food/waste in the tank. My animals munch all day long on all the little critters: crustaceans; copepods, amphipods and others. I also supplement the tank on occasion with seaweed and other similiar items for all my plant lovers.
I have a 72 gallon tank with only 5 fish, two cleaner shrimp, one coral banded shrimp, some snails and crabs and some corals. I have one anemone. I feed 1/2 of a cube of Marine Cuisine per day in the late afternoon. The fish have done well with this over the past six months. I just hate to overfeed and have a problem with waste and detritus.