Flourish is a comprehensive plant supplement for the natural freshwater aquarium. It contains a rich assortment of important micro elements, trace elements and other nutrients. These include calcium, magnesium, iron and other important elements that have been shown to be beneficial to aquatic plants. KEY FEATURES: Comprehensive supplement for the planted aquarium Provides micro elements, trace elements and other nutrients Does not contain significantLevels of nitrogen or phosphorus DIRECTIONS: Use 1 capful (5ml) for each 250L (60 USgallons) once or twice a week. For smaller doses, please note that each cap thread is approximately 1ml. Refrigeration is recommended 3 months after opening.