Sand by AquaNatural. Details:Bahamian Aragonite Aquarium Sand is the ideal substrate for marine, reef or African Cichlid aquariums. It is a pure Oolitic Aragonite sand collected from the crystal clear oceans of The Bahamas, with no harmful tar, organics or impurities. This aquarium sand has unsurpassed buffering capability and helps maintain a natural pH balance of 8.2 without the constant addition of chemicals. One kg of Oolitic Aragonite Aquarium Sand offers over 1 million sq. cm of surface area providing a huge space for housing ammonia, nitrate and nitrite reducing bacteria. Oolitic Aragonite Sand is the ideal grain size for reef tanks, fish tanks, plenum systems and refugiums.