Leaf Zone Aquarium Plant Food helps keep aquarium plants looking beautiful by providing essential nutrients, iron and potassium. Contains a special formula of chelated iron which prevents yellow, decaying leaves and poor growth. Leaf Zone also contains potassium which aids in photosynthesis and cell pressure maintenance. For use in aquariums containing freshwater fish and plants. Treats 474 U.S. gallons. Shipping weight: 3/4 lbs.