This is the DIY feeder I've been using for about 10 years. It is designed to feed small amounts of (thawed) frozen food about every 60-90 minutes throughout the day. It has several components: Mini fridge to keep food chilled as cool as possible. Container to hold the food, suspended in water. Stirring motor to turn a propeller before each feeding to suspend the food throughout the container. Peristaltic dosing pump to send the food from the container to the tank. This also prevents any back-flow into the container. 4a. Flow loop from sump to feeder and back to sump. Board to control the feed cycle. Timer to initiate the feed cycle. I do this with the Apex.