Just what ever you feed your fish. I don't mean target feeding the plankton. All I mean is by having a healthy feeding plan your fish are healthy with a good metabilism. Their for they excrete urine and fecal matter at a higher rate equaling ammonia and dissolved organic matter which in turn feeds your ammonia loving animals and your plankton community. With this we can't forget the beloved water change.
Now don't go trying this at home I don't want to be responsable. 