Fiji Gold Coral and Live Rock Supplement is 100% natural calcium derived from seawater and coral reef substrate. None of the natural resources utilized in this product are derived from living coral. This product can be used effectively to raise calcium, alkalinity and PH levels in your aquarium.Fiji Gold Coral and Live Rock Supplement is beneficial to all organisms especially those that excrete calcium from their exoskeleton or utilize calcification as part of their physiological process. This product will also rapidly increase the growth of coralline algae on your live rock. Fiji Gold Coral and Live Rock Supplement contains calcium, magnesium and all major and minor trace minerals in their natural quantities and molecular structure to benefit invertebrates and fish. Because the minerals are in their natural state absolutely no waste or harmful build up of unused minerals will accumulate in your aquarium.