The CaribSea LifeRock Nano Reef Kit is designed to create a mature and visually appealing reef environment in small saltwater aquariums instantly. The kit includes two LifeRock Nano Arches and one Original LifeRock dry rock piece, each infused with spored bacteria that aids in establishing biological filtration for the tank. These rocks feature millions of micro and macro passages that provide an ideal habitat for beneficial nitrifying bacteria to thrive, ensuring a healthy aquatic environment from day one. This product is ideal for environmentally conscious aquarists looking to enhance their reef setup without impacting natural resources.