I had a customer contact me about building him a feeding chimney similar to what I used on my tanks prior to the big leak last summer. Here's his Eheim auto feeder, the same kind I have. The feeder works great. The problem is the food floats at first, and usually ends up traveling into the overflow and down the drain before the fish can eat it all. With a way to keep the food in one spot, the food soaks up water and sinks into the tank for ...