Brightwell Microvore Microdiet 8.5 oz. (250 ml)
Highly-concentrated ionic magnesium solution designed to support stable water chemistry in marine aquariums.
Provides essential magnesium, which helps regulate the balance between calcium and carbonates in aquarium water. Magnesium is a key component of aragonite, the mineral secreted by reef-building organisms such as corals, clams, and their allies to form skeletal material.
Formulated by a marine scientist, this product is stronger than most competing magnesium solutions and contains no unwanted organic materials such as EDTA, gluconate, or polygluconate.
| Specification | Value |
|---|---|
| Volume | 8.5 oz (250 ml) |
| Active Ingredient | Ionized Magnesium |
| Organic Additives | None (EDTA, gluconate, polygluconate absent) |
| Formulation | Marine scientist-developed |
FAQ
What is the primary function of this magnesium solution in a marine aquarium?
It helps regulate the balance between calcium and carbonates in aquarium water and supports the formation of aragonite, a mineral essential for reef-building organisms like corals and clams.
Does this product contain any organic additives?
No, it contains no organic additives such as EDTA, gluconate, or polygluconate.
Is this product suitable for use in reef tanks?
Yes, it is specifically formulated to support the skeletal growth of reef-building organisms and is recommended for use in reef aquariums.

Dorothy Metcalfe –
I’ve used this magnesium solution for three months in my 120-gallon reef tank. Water chemistry has remained stable, and my corals have shown better growth. No signs of cloudiness or off odors. The liquid form is easy to measure and mix into the water.
Amanda Bower –
The product works well for maintaining magnesium levels. I mix it once a week with my calcium supplement. It’s clear and has a neutral smell. I appreciate that it doesn’t contain EDTA or other organic compounds that can build up over time.
William Gray –
After switching from a generic magnesium product, my tank’s pH and carbonate levels have stabilized. The coral polyps are more active, and the tank feels more balanced. This is a reliable, science-backed solution.