Seiryu stone is a beautiful grey/black aquascaping stone which features striking white veins running through the rock. Our Stone is available for sale by the pound. Each stone ranges from 6 oz to 5 lb. If you require a certain number/size of stones leave your preference in the orders comments and we'll match it as best we can. It is recommended to order 1-2 LB per gallon of tank size. To order 20 LB of stone, select 20 QTY in the shopping cart.