If you have a mini tank I.e .20 ltrs for a few guppies or colourful shrimp or you favourite couple of small fish, this is a great filter. Mine are still filling with the natural bacteria from the water who will biologically break down the pollution in a tank, but the sponge is collecting the waste. Running off an air bubbles, these filters are attached to a solar powered aerator or can be usb charged, it's super quiet filtration and airation and the fish seem to enjoy swimming through the bubbles all day. We're happy.
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