Reef Foundation C is a magnesium complex for balanced formation of coral skeletons. It contains blended salts of Magnesium and is part of Red Sea's complete Reef Care program. For best results dose according to a measured uptake of magnesium and in conjunction with Reef Foundation A and Reef Foundation B.
500 ml / 16.9 fl. oz
Concentration: 1 ml will raise the Mg level of 100 liters (25gal) by 1 ppm.
For proper use of this product you may want to use the Red Sea Magnesium Pro Aquarium Test Kit