There are a number of parameters you need to monitor to maintain a healthy and successful reef tank. Alkalinty and pH are 2 parameters that should be monitorred. Your aquarium’s pH can be in the alkaline range. It is recommended to be between 8.1 and 8.4. Alkalinity is how well your aquarium can resist changes in pH. Alkalinity and pH get confused quite a bit. Alkalinity and pH are related, but not the same. The pH of water is given a logarithmic scale from 1 to 14. The pH of an aquarium is the measurement of hydrogen of in the water given at a power. The changes in an aquarium’s pH in too short a time can cause osmotic shock in your fish and corals. Alkalinity is a complex concept to think about. Your reef aquarium’s alkalinity is recommended to be at 8-12 dkh. Alkalinity is the measure of how much acid (H+ or hydrogen ions) is needed to bring the pH to a specific level. pH and alkalinity are vital to a successful reef tank.