Seachem 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. For macro element (NPK) fertilization, use Seachem Flourish Nitrogen, Seachem Flourish Phosphorus or Seachem Flourish Potassium as needed. Seachem Flourish is safe for invertebrates such as shrimp.