Hang on aquarium filter 600. This hanging filter is suitable for use in a fish tank that is 3ft long/ 90cm, or in aquariums that are up to 120L. The hang on filter 600 model comes with a removable carbon filter cartridge as well as a biological filter cartridge. This aquarium filter is ideal for use in freshwater and saltwater tanks. The three stage filtration on this hang on filter provides protection for medium sized aquariums.