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I have recently added , button polyps, colt coral, Pom poms, Mohawk palies and mushrooms, what additional food should I be feeding, and what brand does one prefer?
No extra food is needed. These corals get everything they need from light and fish poo. As long as you're feeding your fish, you're feeding your corals as well.
Until you get a tank that's quite heavily stocked with corals regular water changes will supply the elements that your corals use up. For soft corals this is mostly alkalinity.