Tropic Marin All For Reef is a revolutionary approach to dosing, combining calcium, alkalinity, and other trace elements into a single, easy to use solution. It's no longer necessary to maintain two, three, or four solutions, or a complicated reactor. All For Reef is a balanced source of calcium and carbonate hardness, released through natural biological processes, along with a mix of trace elements. No mixing, no gas cylinders, no fuss.