Continuum Aquatics ACO30524 Reef Basis Magnesium Liquid for Aquarium 8_5-Ounce

Proper control of magnesium level is imperative for the health and growth of corals as well as maintenance of calcium and buffer levels. Some sea salt mixes are low in magnesium. Continuum recommends that you maintain a magnesium level of between 1,250 and 1,350 mg/L (ppm) for normal reef keeping. This product is also suitable for use by hobbyists who want to raise the magnesium level up to the range of 1,500 to 1,800 mg/L (ppm) for special uses. If you raise the magnesium level that high, be sure to closely monitor the condition of corals and other animals to make sure that they remain healthy and vibrant. Should negative signs such as corals refusing to open, poor coloration etc. be seen, discontinue use and allow the level to decrease until the animals look healthy again.