The feeder is designed for fine-grained fish food and does not tolerate flakes very well. I'm using perfect round tropical chips and I'm having trouble with them. Odd sized flakes don't stand a chance. If you feed your goldfish fine grain food, this is for you. It's like Ehiem and that says it all. There is no double serve, there are only four single serves. No fan to push food out or keep it fresh. Uses a moisture wicking pad which you could taper if you had two if you wanted to. Pay more and get Ehiem.
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