Magnesium Pronto™ 500g Rock NutriGorg is formulated with a

NutriGorg is formulated with a range of particle sizes and the particles are nearly neutrally buoyant

you will eventually need to  replace the blades

The coarse size of SheShells allows for unrestricted water flow and easy maintenance

An excess of heavy metals in the water is toxic to aquatic life

Removes dissolved organic compounds that turn the water yellow

Magnesium Pronto™ 500g Rock NutriGorg is formulated with aMagnesium Pronto is a fast dissolving blend of anhydrous magnesium chloride and anhydrous 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. Packaged in 250g, 500g, and 1 kg jars. Bulk sizes also available.