One of the oldest devices in the aquarium hobby, the corner box filter was originally designed for small aquariums. This filter contains a single airstone attached to a pump that pushes water through layers of activated charcoal and floss contained in a plastic box. The filter itself rests on the gravel bed inside the tank.
Corner filters are inefficient because they take a long time to filter all the water in the tank. They can also be noisy and may float around the tank if they are not weighted down properly. A more efficient power filter is a better choice.
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