CaribSea Arag-Alive Sp. Grade 1-2mm: Arag-Alive! Aragonite Reef Sand with Live Stabilized Marine Bacteria : Use alone, or to kick-start our dry aragonite! Arag-Alive has more surface area for bacterial porosity; approximately 20,000 square inches per cubic inch! Arag-Alive will dramatically reduce cycling time in new set-ups because it contains millions of heterotrophic, autotrophic, and chemolithotrophic bacteria. Arag-Alive has 381,000 ppm calcium, 7,390 ppm strontium, 1050 ppm magnesium, 590,000 ppm carbonate (buffer), 56 ppm potassium, and is lowest in phosphate and has no silica. Arag-Alive also provides molybdenum, barium, boron, selenium, beryllium, and other essential ocean trace elements. CaribSea Arag-Alive is not beach collected. This aragonite comes from the pure and pristine Bahama Banks and unlike beach zone collected sands contains no tar, harmful organics, or impurities.