API Marine Magnesium 473ml - Premium Magnesium Supplement for Saltwater Aquariums | Supports Coral Growth & Fish Health | Ideal for Reef Tanks & Marine Ecosystems

API MARINE MAGNESIUM raises and restores magnesium levels in your reef aquarium, and should be used whenever magnesium deficiency is present in your water. Use API MARINE MAGNESIUM when water tests show a magnesium level below 1,250 ppm mg/L in your reef aquarium.

• Raises magnesium levels
• Helps maintain a thriving reef aquarium
• Dual form of magnesium

Dosage: Shake well. Add 5 ml. per 10 gallons of aquarium water.