Fresh 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. Fresh 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?