Cunina 12 Pack Replacement Filter Cartridges XS Compatible with Tetra Whisper Filter Extra Small Fish Tank Filters & Other Fish Tank Filters Small for Less 3 Gallons Aquarium AccessoriesBrand: Cunina Color: 12 Features: Perfectly Compatible with Tetra Whisper XS: This 12 pack of filter cartridges is compatible with tetra xs filter cartridges and designed specifically for small fish tank filters, compatible with tetra whisper 4i, compatible with Aqueon QuietFlow E Internal 3. Ideal for 3 gallon fish tanks (up to 3 gallons), it ensures clean and clear water, promoting healthy fish and a beautiful aquarium. Works seamlessly with a