Magnesium Pronto 1kg - Two Little Fishies

Two Little Fishies Magnesium Pronto is a fast-dissolving blend of pure anhydrous magnesium chloride and magnesium sulfate that makes it easy and economical to rapidly raise the magnesium ion concentration in aquariums. Supplemental magnesium is often required for reef aquariums because corals, clams, snails, tube worms, and calcareous algae extract it from the water.