Hydrāt-MG – FAQ

What is Hydrāt-MG?
Hydrāt-MG is a concentrated magnesium supplement formulated with hydrated magnesium salts, designed to increase magnesium levels in marine and reef aquariums.

What does Hydrāt-MG do?
It raises magnesium levels and can be used to both maintain normal levels or elevate magnesium beyond natural seawater levels when needed.

What makes Hydrāt-MG different from Magnesion?

• Hydrāt-MG uses hydrated magnesium salts
• Magnesion uses anhydrous magnesium salts (higher purity and concentration)

Hydrāt-MG is often used when elevated magnesium levels are desired or specific results are needed more quickly.

Why would I raise magnesium above normal levels?
In some cases, aquarists intentionally raise magnesium (typically ~1500–1800 ppm) to address specific issues in the aquarium. This should only be done by experienced users and monitored carefully.

What magnesium level should I maintain?

• Normal range: ~1,290–1,320 ppm
• Elevated range (advanced use): ~1,500–1,800 ppm
• Stability is more important than exact numbers

Is Hydrāt-MG safe for fish, corals, and invertebrates?
Yes, when used as directed. However, maintaining elevated magnesium levels for extended periods should be done cautiously and with monitoring.

When should I use Hydrāt-MG?

• When magnesium levels are low
• When standard magnesium supplements are not achieving desired results
• In specific advanced applications requiring elevated magnesium
• When targeting certain nuisance algae conditions (advanced use case)

How do I dose Hydrāt-MG?

• Shake well before use
• Typical maintenance dose: ~5 ml per 20 gallons every other day
• Adjust based on magnesium test results
• For correction, dose gradually until desired level is reached 

How much will Hydrāt-MG raise magnesium levels?
Approximately 1 ml will increase magnesium by ~19.5 ppm per gallon (estimate; always test and adjust).

How often should I dose Hydrāt-MG?

• Daily dosing is preferred for stability
• Adjust frequency based on system demand

Should I test magnesium before dosing?
Yes. Always test magnesium levels before adjusting dosing, especially when targeting elevated levels.

Can I overdose Hydrāt-MG?
Yes. Excess magnesium—especially at elevated levels—can negatively impact aquarium chemistry. Dose carefully and monitor closely.

Can I use Hydrāt-MG with other supplements?
Yes. It works alongside:

• Calcium (Calcion or Reef Code A)
• Alkalinity (Reef Code B)

However, avoid combining with other magnesium supplements unless adjusting a specific imbalance.

What problems does Hydrāt-MG help solve?

• Low magnesium levels
• Difficulty stabilizing calcium and alkalinity
• Situations requiring elevated magnesium levels
• Certain nuisance algae issues (advanced application)

Additional Information

• Magnesium supplement (like Magnesion) but different chemistry
• Used for elevated Mg strategies and specific outcomes
• More advanced use case than standard magnesium dosing

• Magnesion → standard magnesium maintenance
• Hydrāt-MG → targeted / elevated magnesium use (advanced tool)