Brightwell Aquatics Hydrat-MG
Overview
- Safely increases magnesium concentration in all marine and reef aquaria.
- Utilizes specific magnesium salts to obtain the desired results.
- May be used to attain and maintain a magnesium concentration in excess of 1,500 ppm as desired by aquarist.
- Maintaining an elevated magnesium concentration, relative to the average natural seawater concentration, for a prolonged period of time may be of benefit to reef aquaria in certain situations, and should be attempted by experienced aquarists only.
- 75,000 ppm magnesium
Technical Background
In some instances, marine and reef aquarists may find it beneficial to maintain the magnesium concentration in their aquaria within a range of 1,500 ppm.
FAQ
What is the magnesium concentration of Hydrat-MG?
The product contains 75,000 ppm magnesium.
Can Hydrat-MG be used in reef aquaria?
Yes, it can be used in reef aquaria, but maintaining elevated magnesium levels for prolonged periods is recommended only for experienced aquarists.
Is Hydrat-MG suitable for all types of marine tanks?
Yes, it is safe for use in all marine and reef aquaria.

Stephanie Dickens –
I’ve used Hydrat-MG in my reef tank for several months. The magnesium levels stayed stable and my corals showed better coloration. It’s easy to dose and works well with my existing water parameters. Only recommend for experienced reef keepers.
Ian Harris –
The product delivers the magnesium concentration as stated. I added it once a month and noticed a positive effect on my live rock. It’s a reliable supplement, though I’d caution against overuse.
Lauren Ball –
After switching to Hydrat-MG, my tank’s magnesium levels have remained above 1,500 ppm consistently. My anemones are more vibrant and the water clarity has improved. Great product for advanced reef setups.