I have used the Apex AFS feeder, the Eheim Everyday Fish feeder and the Avast Marine The Plank feeder for both small tanks (40 and 75 gal) and large tanks (225 and 360 gal). The Plank worked the best for all sizes of tanks using a variety of foods (pellets, freeze dried, Reef Jerky and mixed food). I define "best" as consistently delivering the desired amount of food repeatedly for up to a week without requiring intervention. I could get all of the feeders to work if I was using them to feed during the day and I would feed the fish at night (and fix any apparent feeder problems). However, if I was gone for a week only The Plank met those requirements. The other two feeders either fed too much or too little or plugged up. The Plank costs significantly more than the other two but I believe it is worth the extra cost.