# Major Elements

Calcium (Ca): Calcium is a vital element for the growth of coral and other invertebrates in the reef tank. It is often added to the tank in the form of calcium carbonate or calcium chloride.

Magnesium (Mg): Magnesium is also important for the growth of coral, and it helps maintain the proper balance of calcium and alkalinity in the water.

Alkalinity (KH): Alkalinity refers to the water's ability to buffer against changes in pH. It is important for maintaining the stability of the water chemistry in the reef tank.

Nitrogen (N): Nitrogen is an essential nutrient for coral growth, and it is typically found in the form of nitrate (NO3) and ammonium (NH4).

Phosphorus (P): Phosphorus is also important for coral growth and is typically found in the form of phosphate (PO4).