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Substrate, gravel or even sand is including in this category. Gravel sold in aquarium shops will usually be chosen for its smooth edges and inert chemical nature. Some substrate (such as coral sand or gravel) used in African cichlid tanks to increase PH level. The gravel size is also important so keep it in mind. When choosing a gravel color keep in mind that it will hide sunken debris more successfully when it black in color… Sand as an aquarium substrate is useful with bottom feeding fish with delicate barbells or with fish inhabits such substrate in nature such as fish from the Xenotilapia family.  Photo by: Nisso
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