Most of the time these days I have been feeding just pellets and leave all pumps on for that. But when I do get out the frozen reef stew, I turn off the return using the AC3 controller (which actually leaves the return off for like 15 minutes and the skimmer off for an hour). The controller also shuts off the closed loop for 5 minutes.

I also put my Vortech in feed mode which still allows a little flow which is nice to keep food from immediately settling and allows enough flow for the corals to sense that it is there to initiate feeding.