https://www.wagtopia.com/products/estes-spectrastone-deep-river-pebble6565827510366Estes Spectrastone Deep River Pebble12.91//cdn.shopify.com/s/files/1/0078/5589/8676/products/46380-1613153934.jpg?v=1621042888//cdn.shopify.com/s/files/1/0078/5589/8676/products/46380-1613153934_large.jpg?v=1621042888USDInStockGravel264052375646Capped Discount264009384030Fish Tank Decor264347943006Freshwater Fish264347975774Saltwater Fish263191035998Sitewide Sale262180864094The Fish ShopSpectrastone deep river pebble is an ideal substrate for fresh water and marine tanks. deep river is an inert stone that will not affect pH.