This sand is reminiscent of the rich soil of the Mississippi Delta Wetlands, with dark browns and earthy tones. 0.8 - 1.2mm in size - it has a dense composition and low fines so does not blow around in your tank. Perfect to create a featured pathway in your aquascape or as a base for a natural 'scape. As a rule of thumb, you need 1lb/gallon, so if you have a 20 gallon tank, 20lbs is enough for a 1/2in layer. If you want to build up the height of your decor or if you have a lower flatter aquarium, change that 1.5-2lbs/gallon