Magnesium is necessary for the growth of hard corals, soft corals and other invertebrates. As magnesium is depleted in reef aquariums,supplements is vital for the growth and flourish of corals and palys a crutial role maintaning high pH needed in marine systems. Direction for Use： Premix the Bio Magneium Supplement totally into the water to be added. Calculate the volume of aquarium water, and add the Bio Magnesium according to the volume. A level of measuring spoon can measure Bio Magnesium Supplement approximately.7.5 g/0.26 oz which can mix in 100 L/26 U.S. gallon water. This will raise magnesium of 40ppm. Maximum dosage of Bio Magneium Supplement don’t recommended over than 50ppm for each time. Caution: Please don’t directly add the Bio Magneium Supplement to your tank. To aviod the stress reaction of marine animals,we recommend to premix Bio Magneium Supplement before adding.