Worldwide Imports AWWA1035 Atlantic 4-Crush Coral, 20-Pound by Worldwide Imports at The Wharf Express. MPN: 29607. Hurry! Limited time offer. Offer valid only while supplies last. 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 spotsï¿½ in bacteria bed.Worldwide Atlantic 4 crush coral 20lb-2. Natural crushed coral gravel. Provides maximum surface area for biological nitrification.
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