The problem you really run into is that the term coral encompasses a vast assortment of highly specialized organisms. What an open brain eats is going to be different than what a Pavona coral eats which will be different from what zoanthids eat ect... Any particular species/ classification of coral you want to know?
Many advocate that the combination of fish waste and detritus work as the best food for coral but again we are talking about a phylum with well over 1250 different species in it.
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