Mark,
If you have good strong lighting, sps as a rule will feed from the carbohydrates (starches & sugars) produced during photosynthesis by the zooxanthelae they host. Bacterias and amino acids are IMO some of the best other food sources they feed on both directly and indirectly. Too long of a story to explain how it all works. Anyway, I think lighting and flow are what you should be concerned about for now.
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Greg
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