sera marin component 1 calcium contains important Calcium for the skeleton build-up of corals and other invertebrates. Decorate algae and low animals need calcium for the setting up of their bowls or their lime skeleton. The calcium concentration in natural sea water amounts to 400-450 mg/l. In the aquarium it should be controlled regularly with a calcium tes. The same calcium content should be in the aquarium. Combined application provided, sera marin 1 and 2 are balanced according to the optimal pH value in saltwater and stabilize the natural buffer system in reef aquariums.Do you have questions about this article ?