Cichlid Trace supplies a broad range of trace elements demonstrated to be necessary for proper fish health and growth. Unlike terrestrial animals fish obtain nutrients from both their food and environment. Trace elements are normally depleted by utilization oxidation and precipitation thus it is important to restore them on a regular basis. Cichlid Trace contains only those elements actually demonstrated to be required by fish. Guaranteed Analysis (Amounts per 1 g) Calcium (min) 2.40% Calcium (max) 2.64 % Magnesium (min) 0.792 % Iodine (min) 0.1 % Potassium (min) 0.1 % Copper (min) 0.032 mg Fluorine (max) 0.001 mg Iron (min) 0.007 mg Manganese (min) 0.002 mg Selenium (min) 0.000006 mg Zinc (min) 0.007 mg. Directions: Use 1 capful (5 Milliliter) for every 80L (20 gallons) once or twice a week. 500 Milliliter / 17 fuel oz. (Treats 8000 L (2115 US Gallons)).