Water Chemistry Adjustment in all East African Cichlid Aquaria Overview Adjusts the chemistry of purified water to approximate that of Lake Malawi, which is able to accomodate cichlids hailing from all three of the East African Great Lakes (Malawi, Tanganyika, and Victoria). Does not increase alkalinity (carbonate hardness). Provides the proper ratios of calcium, magnesium, potassium, sodium, and sulfate, as dictated by limnological surveys of Lake Malawi. Formulated by a marine scientist.