The formula for healthy coral growth, Bio-Calcium re-creates conditions in the aquarium equivalent to a natural reef. Only Carbon dioxide and calcium in the biologically ideal form are added to the water. In contrast to other calcium additives, the ion equilibrium is maintained with Bio-Calcium. The pH-value remains stable. Dosage: 2 times weekly a cut measuring spoon (5 g) on 15 liter water.Do you have questions about this article ?