Aquaforest Mg Plus Lab 2L (magnesium)

Aquaforest Mg Plus Lab 2L High concentrated formula for raising magnesium levels in marine aquariums
Aquaforest Mg Plus is a highly concentrated formula designed to elevate magnesium levels in marine aquariums. This product is specifically formulated to address shortages and sudden drops in magnesium levels, which are essential for the healthy growth of corals.
Maintaining the right magnesium level in your tank water allows corals to absorb calcium more effectively. If magnesium levels drop too low, it can lead to difficulties in maintaining appropriate calcium levels and may also lower the pH of the aquarium.
The ideal magnesium range for reef aquariums is between 1180 – 1460 mg/l (ppm).
Dosage: Adding 10 ml of Mg Plus will raise the magnesium level by 10 mg/l (ppm) in 100 litres (27 US gallons) of water. It is important to base the dosage on your aquarium’s magnesium consumption. Remember, each aquarium is unique, so the final dosage will depend on your coral setup and the specific needs of your aquarium.
Both deficiencies and excesses of micronutrients can impact the health of your aquarium inhabitants. Therefore, it is crucial to select and adjust your dosage based on regular water tests using Aquaforest Lab.
What is great about this product?

Highly concentrated and easy to dose
Safe for aquatic life

Good to know: The recommended magnesium level in aquarium water is 1180 – 1460 mg/l (ppm).

Raising Magnesium With Aquaforest Mg Plus Lab On An SG Reef

This 2L Mg Plus is a concentrated liquid for lifting magnesium when a reef tank reads low, and it’s the bottle we reach for to correct a genuine shortfall rather than for routine top-ups. Magnesium underpins your ability to hold calcium and alkalinity, so when it dips too far you’ll often notice calcium becomes stubborn to maintain and pH starts wandering. Correcting Mg first usually makes the rest of your dosing behave again.

Because it’s concentrated, dose in steps and re-test rather than chasing the target in one go. We tell local customers a magnesium move should be gradual, raising it over several days so corals aren’t shocked by a fast swing, which matters more in our warm tanks where everything reacts quickly. Confirm the low reading with a reliable test kit before adding anything, since salt-mix variation can sometimes be the real culprit rather than consumption.

See related supplements in our marine additives range, and pair this with our calcium and magnesium guide and reef stability guide so your three core parameters stay locked together.