Corals (with a few exceptions) will do very well without being feed when provided with the proper environment within a mature set-up.  Feeding corals will often accelerate their growth. When it comes to feeding, I will place corals into one of two groups, those with large mouths (large polyp corals like brains or plates), and those with very very small mouths (like stony polyp corals).  I have a different approach to feed each.
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