QAN1004 Features: * Aragonite sand * Use with marine aquariums and reef aquariums * For marine aquariums and hard water freshwater aquariums, such as African Cichlids tanks * Contains what fish receive in their natural environments, which is lost in captivity * Graded aragonite sand Options: * Available in 15 lbs and 30 lbs sizes Dimensions: * 15 lbs Dimensions: 2"" H x 13"" W x 19"" D * 30 lbs Dimensions: 3.5"" H x 14"" W x 20"" D