Leaf Zone is a liquid fertilizer containing a special formula of chelated iron and potassium. Iron quickly becomes depleted, resulting in yellow decaying leaves and poor growth. Leaf Zone is readily absorbed through the plant leaves.
Directions for use, with API Dosing Cap on Bottle:
Add 5 ml per 10 U.S. gallons (38 L) of aquarium water. Repeat dose once a week.
Guaranteed Analysis 0-0-3
Soluble Potash 3.00% Iron (Fe) 0.10% 0.10% Chelated Iron (Fe) Derived from: Potassium Sulfate and Iron EDTA.
Another good API product that I've used for many years for both the F/W fish water changes and the PDF tank misting water. The fish also appreciate a Tbl spoon of non-iodized salt per gallon of water (.44 cents at Walmart) to keep bacteria under control.