When magnesium is low, KH fluctuations can occur more frequently which may cause stress to your aquarium. This product must be used alongside our Reef Essential® Aragonite A™ & Reef Essential® Aragonite B™ supplements as together they will provide the required major, minor and trace aragonite elements. If wanting to enhance coral tissue colour & growth, we recommend our Bioactive Colour Intensifiers™. Recommended magnesium concentration = 1230-1310ppm.Contents: Deionised water Magnesium, Sulphate & Trace Instructions:Shaking is not required, however, if product has been left standing for a length of time invert bottle 3-4 times before using.Directions:Add product to high water flow. This product must be used in reef aquariums and can be used on a dosing pump.Dosing:Lightly stocked = 0.50mL/100L per dayModerately stocked = 0.75mL/100L per dayHeavily stocked = 1.00mL/100L per dayOr as required to maintain magnesium between 1230-1310ppmNote: 1mL/100L will raise magnesium by 1ppm, other elements will increase relatively.