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Also known as "oolitic sand," this product is ideal for shallow beds, allowing denitrification in as little as a 1" depth of water. The fine grain size, .2–1.2 mm diameter, can pass easily through the gills of gobies and other sand-sifting organisms. The smooth round grains are gentle to soft-bellied sharks and rays. White in color and free of impurities such as ash, metals, pesticides, and silica, it allows you to create a safe and beautiful environment for your fish and invertebrates.