Once your N-cycle is done. (No/Low KH, No2), make some water change to keep the No3 in low level, then you could introduce some corals in tank. Like Brad said, you'd add a bit of fish food daily for bacteria. But don't add too much corals in tanks, your tank and n-cycle still too weak and not stable yet, it may not handle the amount of fishes you may add later.
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