Our Volcano Ecoscape rock is not only artistic choice for the home aquarium, but also a safe choice for both fish and plants. Volcano is extremely porous and ideal for culturing nitrifying bacteria which help reduce rising dissolved organics. It is inert and will not alter pH or water hardness. These factors make it ideal for aquariums that include dense plants, along with foraging shrimp and other crustaceans. It comes in a variety of shapes and sizes handpicked by the Ecoscape team to give your aquarium a unique look.