MarinePure Gems are the perfect way to add biofiltration to smaller systems. They're the perfect size for canister filters, hanging on the back of filters, or nano-tank filter systems. Each package is suitable for up to a 70 gallon system. Providing biofiltration to your aquarium has never been easier.
Instructions: Rinse with tank watert to remove dust. Place in hang on the back filter, canister filters, or nano tank filters. Good for up to 70 gallons.