Aquarium Equip 0.6L Porous Ceramic African Cichlids filter media 300g African Cichlids filter media "L" (0.6L / 300g) PH7.5~8.0 WITH 1PC Filter Net Bag Suitable for freshwater and saltwater aquariums 400 times effective surface and decomposition rate than normal bio-filter ring. Easily detached bio-membrane improves metabolism of beneficial bacteria. Recyclable for plant soil use.