KEXMY 7lbs of Aquascaping Seiryu Stone Rock Aquarium Tropical Fish Plant Shrimp Driftwood by Seiryu Stone Seiryu Stones are one of the most popular hardscape stones used in aquascaping They are completely shrimp safe for Red Cherry Shrimp, Ghost/Glass Shrimp, and Amano Shimp For these product listing you are buying Pre Selected mixed stone with an estimate of Stone size, Stone shape, weight and look will be chosen by us. We will do the best to pick a mixture of sizes in each order 7 lbs. in weight may get 2 - 4 stone on the order due to heavy in weight on each stone. an average weight on stone is around 2 - 4 lbs. Pictures are for references only. Stone needs a good wash before used not be enough for your aquascaping project. 7 pounds doesn't go very far so if you're working in a big tank, consider 15 or 20 lbs or more see next listing.