On my 30 Gallon African Tank, I used the CaribSea African Cichlid Mix. It is supposed to help with the PH and has a real nice look to it. I used two bags of black and one bag of white. After rinsed each individually i then put the white as my bottom layer, then added the black directly on top. After everything was flat and evenly dispersed, i then took a ruler (anything will work) and made lines through the sand, causing the white to become exposed and shine through. I am really pleased with the product and would use it again if/when i set up an additional tank.