Estes Spectrastone Deep River Pebble by Estes Sold out $26.02 select a variant 5-lb - Translation missing: en.products.status.sold_out 25-lb - Translation missing: en.products.status.sold_out select a variant 5-lb 25-lb Title 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Sold out Spectrastone deep river pebble is an ideal substrate for fresh water and marine tanks. deep river is an inert stone that will not affect pH.IngredientsN/A