Severely depleted levels of magnesium (below 800 mg/L) can
cause depressed pH levels and an inability to maintain proper magnesium
levels. The most frequent causes of magnesium deficiency are use of
kalkwasser, frequent overdosing of a carbonate additive, or low levels
in the salt mix itself. Kalkwasser, for instance, precipitates magnesium
as magnesium hydroxide while excess carbonates precipitate it as
magnesium carbonate. In both cases, this means that magnesium that was
present in the water is now unavailable. Of the two, magnesium hydroxide
and magnesium carbonate, the former is more problematic; it is
extremely insoluble. Once magnesium has precipitated as magnesium
hydroxide, it will never redissolve. Magnesium carbonate will
redissolve; however, it does so slowly. So, while it will go back into
solution, there will be a significant portion of time in which magnesium
levels are depleted.
Reef Advantage Magnesium™ is a concentrated (80,000 ppm)
optimized blend of magnesium, chloride, and sulfate salts designed to
restore depleted levels of magnesium with minimal impact to the ionic
ratios found in natural sea water. Reef Advantage Magnesium™ contains no
ammonia. This is a common contaminant in every liquid magnesium
supplement on the market.
BEGINNER: Use 5 g (1 level teaspoon) per 80 L (20 gallons)
twice a week. Dissolve in at least 250 mL (1 cup) of freshwater. For
precise dosing, use the Seachem Digital spoon scale.
ADVANCED: Check magnesium level, then follow addition
regimen above until magnesium is adjusted to 1,200–1,350 mg/L. Each 5
g/80 L will raise magnesium by about 5 mg/L. Amount or frequency can be
adjusted, but do not exceed 25 g/80 L per day. Thereafter, use as
required to maintain magnesium.
EXPERT: After determining the magnesium depletion rate, set
up a continuous drip system. Use the following formula to determine how
much to add to your top-off water: g=vm/80 (g=grams to add to top off
water, v=volume of tank in liters, 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 into the top-off 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
DO NOT OVERDOSE: Excess magnesium may enhance the loss of
carbonate alkalinity. Do not directly mix with any carbonate supplement.
Best if magnesium & carbonate additives are added on alternate days
or at least 30 minutes apart. Slight clumping of this product may be
encountered but does not impact its use; any clumps will break up very
Amounts per 1 gram
Ingredients: magnesium sulfate, sodium chloride
This is for the 300g bottle, others sizes are available either in store or by request.