Coralife Biocube Original Filter Cartridge Replacements, 2-Pack (3X2 Pack)

THIS IS THREE OF THE THE 2-PACKS (6 Cartridges Total). Replacement BioCube Filter Cartridge 2-Pack for all the Oceanic BioCube Aquariums and Coralife BioCube Aquariums. This is the Oceanic BioCube Size 8 14 & 29 Filter and Coralife Size 14 16 29 & 32 Filter. If you have a BioCube this is the replacement filter. Coralife recommends for optimum efficiency cartridges should be replaced every four to six weeks.