Small World Slate & Stone is proud to offer these beautiful natural brown/grey stones. We have a limited supply of this unique color variation. They are safe for use in your scenery and will not deteriorate in the weather or pet enclosures like resin does. Perfect scale for aquariums/aquascaping and Nano tanks. Great color for more earthy tone tanks and enclosures such as Cichlid tanks, reptile and amphibian enclosures. These stones are easy to incorporate into your tank. They are PH neutral, so are safe for any aquarium. They can be stacked and glued to form fish caves/caverns or benches/seats.. We have sorted and washed these stones and offer them in several size ranges from pathway stones to small scale gravel. Check out our other sizes!