Introducing the SubstrateSource Mighty Aquarium HOB Filter Replacement Media, a comprehensive solution to enhance and maintain the vitality of your aquarium. Crafted specifically for the Mighty Aquarium Hang-on-Back filter series, these mini aquarium filter replacement media units are pivotal in ensuring continued optimal performance of your filtration system. Tailored with precision, these replacement components cater to aquariums ranging from 1 gallon to 24 gallons. The specialized design enhances filtration efficiency, making them idea fish tank filter for all sizes where attention to detail matters most. Experience convenience with replacement tank filter sponges and cartridges included in each order. These components not only make the replacement process swift but also contribute to cost-effectiveness by being reusable. Easy maintenance is at your fingertips; simply rinse the filter for fish tank replacement sponges and cartridges in cool, dechlorinated water. This ensures both longevity for the components and a thriving aquatic habitat within your aquarium. Note: This listing does not include the HOB small fish tank filter unit. Product Specifications: 1. XS MG02 Replacement Sponge Recommended Use: Mighty Aquarium HOB Filter XS MG02 2. S MG04 Replacement Cartridge Recommended Use: Mighty Aquarium HOB Filter S MG04 3. M MG08 Replacement Cartridge Recommended Use: Mighty Aquarium HOB Filter M MG08 4. L MG12 Replacement Cartridge Recommended Use: Mighty Aquarium HOB Filter L MG12 5. XL MG20 Replacement Cartridge Recommended Use: Mighty Aquarium HOB Filter XL MG20 What's Included: 2x Replacement Filter Media for Mighty Aquarium HOB Filter