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FishTanks, as a part of the Substrates category in the Pets and Fish Tanks hierarchy, refers to specially designed containers used to keep fish and other aquatic organisms. These tanks are made from materials such as glass or acrylic, and come in various shapes and sizes to accommodate different types of aquatic environments. The substrate, a crucial component of a fish tank, is the material placed at the bottom of the tank which provides a surface for beneficial bacteria to grow and anchor, aiding in maintaining a healthy ecosystem for the aquatic life. FishTanks can be customized with various substrates like sand, gravel or specialized products that cater to specific needs of the aquatic inhabitants. The choice of substrate plays an important role in creating a thriving aquatic environment within the FishTank.