Seachem Reef Advantage Magnesium
Concentrated formula for magnesium supplementation in marine aquariums
Restore depleted levels of magnesium for optimal aquarium pH and calcium
Contains no ammonia, a common contaminant in liquid magnesium supplements
| Component | Function |
|---|---|
| Magnesium | Supports coral health and stabilizes pH |
| Chloride | Helps maintain natural seawater ionic balance |
| Sulfate | Contributes to overall water chemistry stability |
FAQ
How often should I add Seachem Reef Advantage Magnesium to my marine aquarium?
Add according to water test results; typically every 2 to 4 weeks depending on tank conditions and magnesium levels.
Is Seachem Reef Advantage Magnesium safe for use with other reef supplements?
Yes, it is compatible with most reef supplements and does not disrupt ionic ratios when used as directed.
Does this product affect calcium levels in the aquarium?
No, it is formulated to maintain magnesium without significantly impacting calcium or pH levels.

Connor Dickens –
I’ve used this magnesium supplement for three months now and my coral colors have improved noticeably. The water tests show stable magnesium levels and no ammonia spikes. Easy to mix and effective without altering other water parameters.
Kevin Thomson –
This product works well in my 120-gallon reef tank. I added it every two weeks based on test results and saw a steady improvement in pH stability. No side effects observed, and the formula is clean with no ammonia.
Liam Avery –
Great product for maintaining magnesium levels. I appreciate that it doesn’t contain ammonia, which was a concern with other brands. My tank has been running smoothly with no fluctuations in pH or calcium.