Seachem flourish potassium contains 50 000 mgl of potassium suitable for the natural planted aquariumr potassium is one of several elements that are vitally important to maintaining a vigorous level of growth in a planted aquariumr potassium can become depleted in a rapidly growing system or when the source water has a low mineral contentr in these cases potassium could become the limiting factor to growthr use flourish potassium to prevent potassium depletion signs of which include yellow