The Caribsea Rubble Zone 3.8L for Aquariums is comprised of rubble-sized pieces of high-quality aragonitic calcium carbonate that can be used for a variety of aquarium projects. The Caribsea Rubble Zone is an excellent choice for aquascaping, adding a productive refugium, creating a cryptic zone filter, providing additional buffering capacity for stable pH, or simply increasing biological filtration. Because of its porous aragonitic calcium carbonate structure, the Caribsea Rubble Zone has a variety of beneficial uses. It is ideal as a natural biological filter media and buffering agent in marine aquariums, brackish water setups, African cichlid tanks, and ponds, as well as for supporting efficient biological filtration or proper pH. Its naturally pleasing shapes make it ideal for aquarium rockwork or anchoring coral frags. Before using, thoroughly rinse.
