The Dry Rock does not affect the aquarium nitrogen cycle and may therefore be added to new aquariums and established tanks alike. This dry rock is super porous with plenty of surface area to grow beneficial nitrifying and denitrifying bacteria to act as a biological filter to help maintain pristine water conditions in your tank.Reef aquarium hobbyists get more bang for their buck with high porous, low density aquarium rocks.
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Ad Detail: 25lbs. Sm,Med,Lg Purple Dry Shelf Rock Lightweight, Porous, Aquariums Live
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