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Choose your own filter media for your filter.
Add your choice or combination of dry, solid filter media into this empty cartridge based on your aquarium’s needs; filter media is sold separately.
The customizable cartridge inner capacity is 120 mL with dimensions of 0.57 x 2.3 x 5.8 inches.
Timing to replace the cartridge depends on the media you put inside and depends upon aquarium size, number of fish and plants, and declines in filter performance.