Deskmate Shelf is specifically designed for use in ESHOPPS Deskmate 3.8 gal. desk top aquarium. It is made for fresh water and saltwater application to effectively improve water quality and filtration. It easily slides in under the Deskmate's built in overflow filter compartment to maximize water capture and flow. The Deskmate Shelf is equipped with a pullout handle and three media compartments making maintenance a breeze.