Seachem Reef Advantage Magnesium for Reefs

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Seachem Reef Advantage Magnesium para Arrecifes
  • Seachem Reef Advantage Magnesium para Arrecifes

Seachem Reef Advantage Magnesium for Reefs


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Reef Advantage Magnesium is a concentrated (80,000 ppm) optimized blend of magnesium, chloride and sulfate salts designed to restore depleted magnesium levels with minimal impact to the ion ratios naturally found in seawater. Reef Advantage Magnesium does not contain ammonia. This is a common contaminant in all liquid magnesium supplements on the market.

Extremely low magnesium levels (below 800 mg/L) can cause depressed Ph levels and an inability to maintain adequate magnesium levels . The most common causes of magnesium deficiency are the use of calcium softeners, frequent overdosing of a carbonate additive, or low levels in the salt mix itself. Calcifiers, for example, precipitate magnesium as magnesium hydroxide while excess carbonates precipitate it as magnesium carbonate.

In both cases, this means that the magnesium that was present in the water is now unavailable. Of the two, magnesium hydroxide and magnesium carbonate, the former is more troublesome, being extremely insoluble.

Once magnesium has precipitated as magnesium hydroxide, it will never dissolve again. Magnesium carbonate will re-dissolve however it does so slowly. Then the level of magnesium in the water will not be sufficient and Reef Advantage Magnesium will have to be added.


Concentrated, blended, ion-balanced magnesium source
does not contain ammonia
Vitally important in preventing ion imbalance

Instructions for use


Use 5 g (1 level teaspoon) per 80 L (20 gallons) twice a week. Dissolve in at least 250 ml (1 cup) of fresh water. For accurate dosing, use the Seachem Digital Spoon Scale.


Check magnesium level, then follow above addition regimen until magnesium adjusts to 1,200-1,350 mg/L. Each 5 g/80 L will raise magnesium by approximately 5 mg/L. Amount or frequency can be adjusted , but do not exceed 25 g / 80 L per day. Thereafter, use as needed to maintain magnesium.


After determining the rate of magnesium depletion, set up a continuous drip system. Use the following formula to determine how much to add to your top water: g = vm / 80 (g = gbranches to add to the top of the water, v = tank volume in litres, m = amount to raise magnesium in mg/ L). For example, if you want to raise magnesium by 10 mg/L in a 200 liter tank, then you would add (200x10)/80 = 25 g in the top water. [For reference: 1 gallon = 3.8 liters, 5 g = 1 teaspoon]. Notes: Use the Reef Status: ? Magnesium, Carbonate & Borate test kit to check magnesium levels.

Do not overdose

Excess magnesium can increase carbonate alkalinity loss. Do not mix directly with any carbonate supplement. Best if magnesium and carbonate additives are added every other day or at least 30 minutes apart. A slight clumping of this product may be found, but it does not affect its use; any group will break up very easily.


Format, 300grs, 1, 4 and 20Kgs


Main ingredients

Magnesium sulfate, sodium chloride

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