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 levels.
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 easily.
Reef Advantage Magnesium™ Dosing Tables
Standard Dose
Adds approx. 5 mg/L magnesium
| Water Volume | 1 qt / 1 L | 1 gal / 4 L | 10 gal / 40 L | 50 gal / 200 L |
| RA Calcium™ Dose (g) | 0.062 g | 0.25 g | 2.5 g | 12.5 g |
| RA Calcium™ Dose (tsp) | 1/60 tsp | 1/20 tsp | 1/2 tsp | 2 1/2 tsp |
Formula
Want a different result? Here's how to calculate it:
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Dose in grams =
Your tank volume (gal) x the amount you want to raise your magnesium (mg/L) x 0.05
Do not raise your magnesium by more than 25 mg/L in a single day
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Dose in teaspoons =
Your tank volume (gal) x the amount you want to raise your magnesium (mg/L) x 0.01
Do not raise your magnesium by more than 25 mg/L in a single day
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