Don't just put rocks in your tank, ROCK YOUR REEF with LifeRock Shelf Rock! Spectacular shelves make the perfect display area for inverts or use shelves to create caves and platforms. Amazing porosity, incredible biological performance (drops ammonia levels like real live rock!), and unsurpassed realism make LifeRock the best, and most cost effective choice for any aquarist. Nature Perfected, Nature Protected, that's LifeRock from CaribSea.