I try. Unless you have a small colony, it is difficult. Just do your best.
My acans get fed LPS coral pellets about once a week or so. I feed the whole tank Tropic Marine Coral Reef Snow and Coral Phyton twice a week. The acans really extend their feeder tentacles and feed well on that. So all the polyps get fed then. The polyp extension on my acans increased a lot when I started the Tropic Marine Snow and Phyton progam. My SPS polyps have incredible extension now, too.
Acans have a mouth and will take food bits, but you should ensure they get fed via polyps too. I saw nice color change when they started getting fed this way too.