Brightwell Aquatics Magnesion
Overview
- Highly-concentrated ionic magnesium solution
- Provides magnesium, which helps regulate the balance between calcium and carbonates in aquarium water, and is a component of aragonite, the mineral secreted by reef-building organisms such as corals, clams, and their allies to form skeletal material
- Stronger than most competing products
- Contains no unwanted organic material such as EDTA, gluconate, or polygluconate
- Formulated by a marine scientist
Technical Background
Magnesium plays a vital role in reef aquaria: it helps maintain calcium and carbonate (composing the majority of measurable alkalinity) concentrations by limiting unwanted inorganic precipitation with each other.
| Specification | Value |
|---|---|
| Magnesium Concentration | Highly concentrated ionic form |
| Organic Additives | None (EDTA, gluconate, polygluconate absent) |
| Formulation Basis | Marine scientist-developed |
| Primary Function | Stabilizes calcium-carbonate balance in reef tanks |
FAQ
What is the main benefit of using Magnesion in a reef aquarium?
Magnesion helps maintain the balance between calcium and carbonates in aquarium water, preventing unwanted precipitation and supporting the growth of reef-building organisms like corals and clams.
Does Magnesion contain any organic additives?
No, Magnesion contains no organic materials such as EDTA, gluconate, or polygluconate.
Is Magnesion suitable for all types of aquariums?
It is specifically formulated for reef aquaria where stable calcium and carbonate levels are essential for coral health.

Carl Peters –
I’ve used Magnesion for three months in my 120-gallon reef tank. The magnesium levels stayed stable without needing frequent adjustments. My corals have grown more vibrant and the water chemistry remains balanced. No signs of cloudiness or precipitation issues.
Dorothy Vance –
After switching from a generic magnesium supplement, I noticed a significant improvement in my tank’s stability. The water clarity improved and my polyps became more active. No organic additives mean I don’t have to worry about chemical buildup.
Faith Wallace –
The product works well in maintaining magnesium levels. It’s slightly more concentrated than other brands I’ve tried. I still need to monitor alkalinity occasionally, but overall it’s reliable and effective.