Our Stacked Greystone Ecoscape offering is not only an artistic choice for the home aquarium, but also a safe choice for both fish and plants. Greystone is an igneous rock that forms on the Earth's mantle. It has deep striations and pores which make it an ideal aquascaping tool. It is inert and will not alter pH or hardness. It comes in a variety of shapes and sizes handpicked by the Ecoscape team to give your aquarium a unique look.