CaribSea's Eco-Complete African Cichlid substrate is complete with minerals and contains aragonite! Eco-Complete maintains the high pH that African Cichlids need while helping to resist pH drops associated with cichlid systems, eliminating the constant addition of chemicals. It buffers automatically for the life of the aquarium and adds calcium, magnesium, carbonate, and more! The unique composition recreates the African Rift Lake environment. Eco-Complete's high internal porosity maximizes biological capacity which keeps your fish healthier. Eco-Complete Cichlid substrate is biologically complete. It contains live, water purifying bacteria that makes cycling a new aquarium faster and safer. It also creates a natural biological balance which discourages nuisance algae. No rinsing required! Eco-Complete is packed in a water conditioning solution for immediate results! The 20 pound bag of Eco-Complete Cichlid White Sand has a typical grain size between 0.5 mm and 1.5 mm and features an average density of 54 pounds per cubic foot.