Feeding corals in a immature closed ecosystem as our tanks will result in raised levels of PO4 and the effects of that to the reef, can be from disatrous to none!!Sings of it(PO4) will be algae on the tanks glass surfaces, and reduced coraline growth.then derbesia, or bryopsis will grow on the rock, if you keep poluting the water.....there is a chance though, that the livestock will consume most off the food, and that is the best ballance you can achieve!!!!
Keep doing it, but be carefull and open the skimmer, after feeding to catch the remaining organics!