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. Directions Use 1 capful (5 mL) for every 80 L (20 US gallons) twice a week. Guaranteed Analysis Amounts per 1 gram 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) 0.00006 mg Zinc (min) 0.007 mg Ingredients: calcium chloride, magnesium chloride, potassium iodide, copper sulfate, iron sulfate, zinc sulfate, manganese sulfate, sodium fluoride, selenium AAC