







🌊 Elevate your reef’s glow with the pure power of magnesium!
Brightwell Aquatics Magnesion is a highly concentrated, pure ionic magnesium liquid designed to optimize calcium and carbonate balance in reef and marine aquariums. Free from unwanted organics, it supports healthy coral and clam skeleton formation by maintaining magnesium levels between 1,290-1,320 ppm. Scientifically formulated and made in the USA, this 67.6 fl oz solution offers precise dosing for up to 1,000 gallons, ensuring vibrant, thriving aquatic ecosystems.









| Brand | Brightwell Aquatics |
| Customer Reviews | 4.6 out of 5 stars 413 Reviews |
| Item Form | Liquid |
| Item Weight | 1 Pounds |
| Liquid Volume | 67 Fluid Ounces |
| Manufacturer | TopDawg Pet Supply |
| UPC | 810086010394 |
N**N
Great product.
This works very well. My tank loves it. The coral is very happy and it didn’t have any side effects. Very easy to use and doesn’t cloud the water like others do. Great value.
C**Y
Nice product that works as expected.
All I can say is "Brightwell Aquatics" makes some great products. I've used them for years. and trust my nano reef to them. Magnesium, Calcium, PH/Alk, pretty much anything I need to dose is from them. I have a 6 gallon nano reef tank and it can be a bit of a pain to dose, and keep parameters at the right levels. So far "Brightwell Aquatics" seems to work the best for smaller dosing without tanking or spiking.
U**S
Excellent!
While buying powder or granulate to dilute in water is cheaper. This solution is more concentrated that the one you can make with the powder so you achieve your goal faster.
K**S
Best magnesium we’ve used!
Love this magnesium! Works great for our reef tank and worth the price!! It’s not too powerful that it throws our water parameters off, but gives us a boost when needed! Have purchased multiple times and will purchase again in the future! Exactly what we needed!!
T**Y
Good supplement to help reduce the need for water changes in small tanks
Easily added. Clear liquid did not cloud or Haze water. Did not have odor. I did notice immediate positive changes in corals. I did not notice any nitrate increases when adding this product. I used this in conjunction with another of their products to help reduce the amount of water changes I needed to do.
B**B
A very good bargain
Price was right
J**O
Good Magnesium results. Good product.
I've been adding 30ML of this magnesium to my 125 Gallon reef tank. Tank readings have gone from 1200ppm to 1260ppm. I'm adding it slowly. Only 3 days a week. It's going to take a while but I'm working on getting up to 1450ppm.
L**Z
Strong but efficient
I just add 20ml when my Mag is under 1300 and bring my Mag to 14XX in my 75g mix reef tank.
Trustpilot
2 days ago
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