Seachem Flourish Potassium is a high quality potassium fertiliser for aquarium plants. It contains 50,000 mg/l of potassium and helps to prevent deficiency symptoms, promote growth and make plants more resistant. A sufficient supply of potassium is essential, especially in densely planted aquariums or aquariums with high levels of CO2. Flourish Potassium is safe for fish and invertebrates and can be used regularly as a targeted nutrient.Seachem Flourish Potassium contains 50,000 mg/L of potassium suitable for the natural planted aquarium. Potassium is one of several elements that are vitally important to maintaining a vigorous level of growth in a planted aquarium. Potassium can become depleted in a rapidly growing system or when the source water has a low mineral content. In these cases potassium could become the limiting factor to growth. Use Seachem Flourish Potassium to prevent potassium depletion (signs of which include yellowing in older leaves) and maintain the highest level of