Atlantic Crushed Coral #4 20lb 2pk

<P>Premium Atlantic Crushed Coral with Aragonite #4</P><P>Benefits of Atlantic Crushed Coral:</P><P>100% from the Ocean Floor. Natural crushed coral gravel. Maintains superior pH and marine chemical balance. Provides maximum surface area for biological nitrification. Scientifically graded for uniformity which provides maximum water flow and aeration. Prevents anaerobic Dead Spots