I have this in a 10 gallon (I think) round tank with 3 fish and it works fine. I've had the filter for 2 months now and in the first month I might have fed the fish too much because I used 3 filters in one month. I use it with the Fluval U1 underwater filter. After figuring out the feeding schedule, I only had to use 2 filters. Installation: Mostly plug and play.
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