Maintain Optimal Reef Chemistry with the Corals Lab Magnesium Test Kit. Magnesium is the foundation of a thriving reef aquarium. This test kit delivers precise measurements to keep magnesium levels in the ideal range, directly supporting calcium availability and coral skeletal growth. Without proper magnesium, calcium precipitates out of solution, starving your corals and invertebrates of the building blocks they need. The kit features a reliable titration method with everything included—reagents, vessel, and clear instructions. Regular testing prevents chemistry imbalances that compromise coral health and pH stability. Whether you're maintaining SPS, LPS, or a mixed reef, accurate magnesium monitoring is non-negotiable for long-term success. Simple to use. Essential for results.