The carbon hardness value ( KH ) indicates the alkalinity - ie the hardness (in ° DH) of the water. The alkalinity depends on the amount of basic ions present in the water, mainly the content of carbonates.Carbonates serve to supply corals with carbon. The carbon (carbon) contained in the bicarbonates is important for the photosynthesis of corals.T..
Magnesium is a chemical element with the element symbol MgMagnesium is extremely important for most reef inhabitants, but especially for corals. Magnesium together with calcium is responsible for the alkalinity (KH), ie the hardness in the water. Magnesium is consumed in seawater aquarium in significantly lower amounts than eg calcium, but should s..