Universal 4 to 6 mm aragonite substrate for calcium reactors. It consists of pure aragonite, calcareous algae, small shells, foraminifera, coral fragments and other calcareous marine organisms. With a rich concentration of calcium, carbonate, magnesium, strontium, potassium and other essential trace elements, it's the ideal substrate for calcium reactors needed for the growth of fish, soft and hard corals, crustaceans and all other aquatic organisms. Reduces CO2 consumption.
