Natural seawater has an average magnesium content of 1280–1300 mg/l. First, measure the magnesium concentration of your aquarium water and estimate the water volume of your tank system, taking into account the decoration (stones, etc.).

Powder

The addition of one measuring spoon of Tropic Marin® Bio-Magnesium increases the magnesium content by about 10 mg/l per 100 l (26 gallons) of water.

Maximum recommended dose: 2 measuring spoons per 100 litres (26 gallons) of aquarium system water volume per day.

To use, fill the dosing spoon with Tropic Marin® Bio-Magnesium and level using scraper. Distribute the contents of the measuring spoon well by stirring at the surface of the water. Make sure that no larger undissolved Tropic Marin® Bio-Magnesium crystals come into direct contact with the corals. Add the next spoon when the previous one has dissolved.

Liquid

The addition of ½ fl.oz./15 ml will raise the magnesium level of 10 US-gal./38 l by approx. 21 mg/l (ppm).

Maximum recommended dose: ½ fl.oz./15 ml per 10 USgal./38 l of aquarium water per day.
Tropic Marin® Bio-Magnesium Liquid can be added to the tank water either directly or by a dosing pump.

To refill the bottle you can fill up 16 oz./450 g crystalline Tropic Marin® Bio-Magnesium with reverse osmosis water to 0.26 US-gal./1 liter solution.

Concentrations of more than 1600 mg/l magnesium should be avoided, as various organisms may react negatively to extremely high magnesium levels.

Over time, the specific gravity of the water can increase slightly. Please check the specific gravity regularly. Besides the magnesium concentration, the calcium content should also be monitored. Use the Tropic Marin® Calcium/ Magnesium-Combitest Professional for monitoring these levels, and the Tropic Marin® Carbo-Calcium and Tropic Marin® Bio-Magnesium to adjust them when needed.

CALCULATOR