In all the scientific papers I've read, SPS actually derive much of their calories from captured prey, not photosynthesis and fish poop like many people thinks they do. That said they can also survive on just light and detritus, though you'll have more vigorous growth and healthier corals if they are capturing prey.
If you have a mature tank, they could capture micro fauna that thrives in the tank but you can also feed a powdered feed. I use coral frenzy and reefroids when I remember but I try to ,imit how much I use it because if you over feed it, it just rots in the tank if it's not eaten or removed with the skimmer.
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