Why use Eco-Complete™ for African Cichlids? First of all, it's minerologically complete. This substrate contains Aragonite, making it a perfect African cichlid substrate. Aragonite, which is unique to just CaribSea substrates, maintains the high pH African Cichlids need without the constant addition of chemicals. When the pH in your aquarium falls below 8.2, Aragonite snaps into action, breaking down into calcium (great for water hardness), carbonate (your buffer), and various beneficial trace elements like Magnesium. Your pH comes back up and the tank stays healthy, all without ever adding a single chemical. Other types of calcium carbonate don't react until the pH is in the mid 7's. In fact, Aragonite holds the highest pH of any gravel or sand, and has up to 30 times the buffering capacity of Dolomite, Calcite ("crushed corals"), or Oyster shell! Plus, unlike ordinary substrates, Aragonite never needs replacement, buffering automatically for the life of an aquarium. Eco-Complete™ for African Cichlids has a unique composition that re-creates the African Rift Lake environment in your aquarium.