ESV Bionic Magnesium, 1 gal.When used with calcium and alkalinity supplements, magnesium plays an important role in stablilizing pH in your reef tank. B-Ionic Magnesium is an easy to use liquid magnesium supplement which will not disrupt the ionic balance of closed marine tank. Add 1.5 mL per gallon of aquarium capacity per day until a target level of 1200-1350 ppm magnesium is reached.ESV Bionic Magnesium, 1 gal.When used with calcium and alkalinity supplements, magnesium plays an important role in stablilizing pH in your reef tank. B-Ionic Magnesium is an easy to use liquid magnesium supplement which will not disrupt the ionic balance of closed marine tank. Add 1.5 mL per gallon of aquarium capacity per day until a target level of 1200-1350 ppm magnesium is reached.Magnesium, when used with calcium and alkalinity supplements, plays an important role in stablilizing pH in your reef tank. B-Ionic Magnesium is an easy to use liquid magnesium supplement which will not disrupt the ionic balance of closed marine tank.Instructions:Add 1.5 mL per gallon of aquarium capacity per day until a target level of 1200-1350 ppm magnesium is reached.B-Ionic Magnesium contains 36,000 ppm magnesium, and 1 mL will raise 1 gallon of aquarium water by 10 ppm.Product code: 3659Item No. AD-ESV-MAG-1GAL