CaribSea Aragonite buffers to the highest pH and delivers more calcium, carbonate, and trace elements than any other substrate. Little or no rinsing required, aragonite keeps aquariums healthier, longer. Caribsea Aragonite Fiji Pink Reef is the perfect substrate for African cichlids, buffering to a pH of 8.2 - It is also ideal for marine and reef aquariums. Caribsea Aragonite is collected from pristine ocean waters. It reduces fish stress by replicating their natural habitat. This is an environmentally responsible product with no beech or reef zone disturbed. It is an aid to your biological filtration because it controls nitrite, ammonia and other wastes. It is ideal for shallow beds and reef bottom cover. Please note this product is not to be confused with Arag-Alive Fiji Pink live sand which is packed in real sea water and contains additional marine bacteria to keep your marine tank to the optimum levels. Suitable for marine tanks.