API Marine Magnesium Raises Magnesium Levels in Reef Aquariums, 16 oz Renaissance Each shelter is made with

Each shelter is made with non-porous exterior surfaces that are easy to clean with soapy water

Removes organic pollutants from water

The rubber band ensures a secure fit

No Artificial Colors

API Marine Magnesium Raises Magnesium Levels in Reef Aquariums, 16 oz Renaissance Each shelter is made withAPI Marine Magnesium Raises Magnesium Levels in Reef Aquariums raises and restores magnesium levels in your reef aquarium, and should be used whenever a magnesium deficiency is present in your water. The magnesium level of a reef aquarium should be between 1,250 to 1,450 ppm. Use API Marine Magnesium when water tests show a magnesium level below 1,250 ppm mg L in your reef aquarium. Dose according to directions on the product label. Treats up to 948