API Leaf Zone 473ml API Leaf Zone is a liquid fertiliser suitable for aquariums with live plants. Containing vital iron and potassium for colourful leaves and a healthy planted aquarium. Is formulated for rapid absorption through the plants leaves and also helps to stimulate plant growth. Is best used as a weekly additive for optimal aquarium plant health condition. For best results, use LEAF ZONE in combination with API ROOT TABS tablet fertilizer. Monthly addition of ROOT TABS nourishes roots, stems and leaves to promote more vibrant aquatic plants. DIRECTIONS: Use the API Dosing Cap on the Bottle. Add 5ml per 38 liters of aquarium water. Dose weekly.