We ranked all the filters below so YOU can compare prices and ratings before you buy. The models listed below are great for tanks smaller than 10 gallons. In some cases, they are also available in smaller and larger capacities.
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If you’re looking for something smaller than the filters above, check out our post on Betta Mini Internal Aquarium Filter. Or, if picking the right type and size of the filter isn’t your thing – why not just buy an aquarium kit that comes with a filter included.