Aqueon Betta Filter with Natural PlantAqueon Betta Filters are air operated filters that improve water quality by filtering water in small betta habitats, such as bowls and aquariums up to 3 gallons. The replaceable carbon and sponge cartridge keeps water cleaner and clearer. Each filter comes with a decoration (natural plant or volcano) to conceal the filter, along with accessories for operation (airline tubing, airline tubing suction cups, air adjustment valve and check valve). An air