Calcium (Ca)
Natural Seawater Value: 400 mg/L
Acceptable Range: 350 to 450 mg/L
Calcium is critical to healthy coral
skeletal growth, and many other biological processes. Maintenance of calcium levels that are
at or near seawater values is an important factor in having a healthy reef aquarium.
Magnesium (Mg)
Natural Seawater Value: 1280 mg/L
Acceptable Range: 1100 to 1400 mg/L
Magnesium is a very important part of the water buffering system, and is incorporated into coral skeletons. It is also critical to any photosynthetic processes.
Alkalinity (meq/L)
Natural Seawater Value: 2.5 meq/L (7 dKH)
Acceptable Range: 2.5 to 5.0 meq/L (7 - 14 dKH)
Maintaining an appropriate alkalinity is crucial to maintaining a healthy aquarium. A fluctuating alkalinity will lead to serious problems in maintaining an appropriate pH, as well as problems keeping calcium and magnesium levels within required ranges