Aqua One 119s Sponge for Betta Mono Aquarium

A new Aqua One 119s Sponge. An open cell bio sponge insert for the Betta Mono Aquarium. Simply slides into the rear filtration compartment to replace a worn out insert. May be rinsed clean in aquarium water. Ideally do not change this and the 102c ceramic cartridge in the same month as too many filtration bacteria may be lost.