Throughout your reef keeping journey there are 5 major tests that you will need to preform. You need to monitor your Alkalinity, Calcium, Magnesium, Nitrate and Phosphate (Kh, Ca, Mg, NO3 and PO4) for your corals to grow and to maintain optimum reef health. This bundle takes the guess work out of what you need to purchase to ensure you have long term success keeping your reef tank thriving.