Our Lava Tube Ecoscape rock is not only artistic choice for the home aquarium, but also a safe choice for both fish and plants. Lava Tube Rock shares many properties with Volcano Rock, and is extremely porous and ideal for culturing nitrifying bacteria to 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. Lava Tube rock is extremely durable and maintains heat, making it a superb choice for the tropical aquarium. It comes in a variety of shapes and sizes handpicked by the Ecoscape team to give your aquarium a unique look.