The Automatic Feeding System (AFS) is the only automatic fish feeder designed specifically to work with the Apex AquaController. Not only does it seal your food to keep it dry, but it meters out small amounts of food on the schedule you set right in your Apex. And, you can set up more complex feeding routines that tell it to feed only after doing things like turning off your pumps, skimmer, etc. and then having them come back on automatically after feeding time!