I use Red Sea A and B amino acids/carbohydrates all the time. As for solid coral food, I use a mix of live phyto, BRS Reef Chili, and Marc Weiss Reef Bugs. I don't really spot feed, just turn off skimmer for a bit and dump in high flow area. I know most Marc Weiss products are bunk, but everything in the tank seems to like the reef bugs. All my fish, including my mandarin, and LPS eat up the larger particles. All my SPS, including acros, show good feeding response. They don't show a response with just the reef chili.