Review on Optimized Aihotim Submersible Foam Filter, Ultra Mini Aquarium Single Sponge Filter, Whisper Quiet Fish Tank Filter, for Small Fish Tank 0.5-5 Gallon, Ideal for Freshwater and Saltwater Environments by Stephanie Elliott

This design is used by several brands, but hopefully this message gets you by using a piece of rubber tubing (a thicker variety like external filter tubing) that was rackets thicker Diameter. and the smaller inner diameter increased airflow and reduced bubbles. When you reduce the external flow, the air comes out faster, which causes the water to move faster, giving you more suction power from your sponge. Note that I have to clean the filter much more often, but I would rather do that than have a larger sponge filter or other filter in my aquarium. Overall a great purchase for the price, just don't plan on using it for more than a gallon.