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.