Hygger fish tank sponge filter must be used with an aquarium air pump. It is fit for small size (

Multi-filtration functionsThis mini sponge filters integrated bio-filtration, oxygenation, and physical filtration in one. It also makes small water flow, which can ensure the excellence of the water quality. Help your small fish or shrimp to live a happy & healthy life.Super mini filter dimensionThe sponge filter is super mini and takes up a little room. It is fit for fish tanks or fish bowls sized from 0.5 to 5 gallons. This mini sponge filter is 3.5″ in width and 3″ in height, and the sponge inside circle diameter is 0.59 inch.Removable fine spongesYou can easily take down the sponge from the filter for cleaning or replacement. The sponge is fine, not coarse, which means more surface area for beneficial bacteria to live on. Don’t use tap water to clean it. Rinse or squeeze the sponges using the aquarium water.