Nature's Ocean Coral Base Rock - 12 Inch, 40 lbs - Natural Porous Structure, Supports Aquascaping & Live Coral Growth, Ideal for Marine & Reef Tanks

Nature's Ocean Coral Base Rocks 40LBS (Packaged: 2 per case 12 Inch - 17 Inch)Nature's Ocean Base Rock is 100% premium all natural aragonite rock covered with naturally formed holes and crevices which makes for some very interesting and unique shapes and is easy to stack when creating a base for growing live coral or as an addition to existing coral-based ecosystems. This porous characteristic provides a natural biological filter as well as a perfect environment for denitrifying marine bacteria to grow and flourish, which effectively reduces nitrates in your tank.