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Aquarium stones, or gravel, are natural or synthetic materials used as substrate in fish tanks. They vary in size, shape, and color, ranging from smooth river rocks to jagged volcanic stones. These stones provide aesthetic appeal and functional benefits, such as promoting biological filtration by housing beneficial bacteria. They also create hiding spots for fish and serve as a foundation for aquarium plants. Stones can be made from materials like limestone, silica sand, or river rock, with colors ranging from natural earth tones to vibrant hues. Regular cleaning is essential to maintain water quality and prevent debris buildup.