Reef advantage magnesium is a concentrated 80 000 ppm optimized blend of magnesium chloride and sulfate salts designed to restore depleted levels of magnesium with minimal impact to the ionic ratios found in natural sea waterr reef advantage magnesium contains no ammoniar this is a common contaminant in every liquid magnesium supplement on the market severely depleted levels of magnesium below 800 mgl can cause depressed ph levels and an inability to maintain proper calcium levelsr ma