Check the listing for details. Reef Foundation A - Calcium (CA) (500 ml) Liquid - Red Sea. Condition: New. Listed at 19.99 USD. The foundation elements A successful coral reef aquarium depends on how well you maintain the water parameters which are the key to a stable coral environment. All of the elements found in natural seawater play a role in providing optimal water parameters, but some are more significant than others. These elements, the foundation of the reef environment, include the three major elements: Calcium (Ca), Magnesium (Mg) and Carbonates (CO3). All three have a major effect on water chemistry (pH stability, Alkalinity, ionic strength) and on many of the coral’s biological processes (skeleton formation, ions exchange, photosynthesis). The foundation elements complement each other in the formation of coral skeleton. If not balanced correctly one of the elements will quickly limit healthy coral growth. Reef Foundation A (Ca/SR): Contains Calcium, Strontium, and Barium according to the ratios found in coral skeleton. Concentration: 1ml will raise the Ca level of 100 liters (25 gal) by 2ppm Listing and template services provided by inkFrog