Reef aquarists today understand that natural levels of magnesium are necessary for corals and coraline algae to process calcium correctly, enabling them to grow strong, healthy skeletal structures. Salifert's Magnesium Test Kit is unsurpassed in sensitivity and accuracy, and will not be affected by strontium or calcium interference in normal circumstances. It measures magnesium in steps of 30 mg/liter with a bold color change for unmistakable results.
