Replaces biologically important trace minerals which are used by fish and plants and removed through filtration in African Cichlid and other Rift Lake fish tanks. This is the most complete product on the market for Africans nothing like it exists anywhere! You will see vibrant colors like never before! Also will benefit most American Cichlids whose native waters are hard and have a pH above 7.8! Free of polluting nitrates phosphates and organic chemicals!