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Aquarium gravel refers to specialized small stones used to decorate and line the bottom of aquariums, creating a naturalistic environment for fish and other aquatic organisms. The gravel provides a surface for beneficial bacteria to grow, which helps maintain the water quality in the tank. It also serves as an anchor for live plants and decorations, providing a visually appealing backdrop for the aquarium inhabitants. The use of aquarium gravel is relevant to the broader categories of pets, small animal feed, and reptile food, as it forms part of the habitat and care regimen for a variety of aquatic creatures, including fish, amphibians, and invertebrates.