Our Red Mesa Ecoscape rock is not only an artistic choice for the home aquarium, but also a safe choice for both fish and plants. Red Mesa rock is a combination of igneous rock that has formed over a long period. Its red striations and warm colors make a beautiful contrast against darker substrates for planted aquaria. 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.