Our Complete Tank System is a simple and effective all-in-one solution designed to support vibrant coral growth, strong skeletal development, and overall tank health. Part 1 of our Complete Tank System is packed with bioavailable Calcium and Magnesium, to help maintain ideal water chemistry for stony corals and other calcium-dependent organisms. A precise blend of essential Trace Minerals mimics natural seawater conditions, replenishing what gets depleted over time. And finally, we’ve added Amino Acids to fuel coral growth and metabolic activity. Perfect for reef keepers who want maximum results with minimal dosing complexity. Can be used as a standalone part 1 to be combined with other alkalinity products. IDEAL CALCIUM & MAGNESIUM LEVELS Recommended calcium and magnesium levels to maintain a healthy reef aquarium are: Calcium: Between 430–450 parts per million (ppm). Magnesium: Between 1200-1400 parts per million (ppm). This product is intended to maintain magnesium levels when used with both parts of the Complete Tank System. For tank magnesium levels below 1200 ppm, it is recommended to use a separate magnesium product to bring levels within the ideal range. If calcium is low, and magnesium is at or above the suggested ideal range, this product can still be used.