Lifegard Aquatics BLACK SATIN ALL NATURAL Aquarium sand is of the highest quality, free of any chemicals, dust and heavy metals. It is a perfect solution for simulating a natural environment in your aquarium or terrarium. Safe for both saltwater and freshwater tanks and ideal for planted tanks, betta bowls, shrimp habitat as well as sand digging fish like Corydoras and Loaches. Lifegard Black Satin sand exceeds the Industry specifications of environmental standards. A 100% recycled, "green" product. Approximate size 20/40 Mesh Size. The best way to calculate the required amount of soil for your tank is to use 1.5 lbs. of sand per gallon of tank volume. So if you have a 10 gallon tank you should use 15 lbs. of sand to properly cover the bottom and provide enough rooting area for plant growth.