Low Magnesium Levels Reef Tank

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Chrisz

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Good morning all!

I have unfortunately let my tank go and am trying to get things under control again. I have a 97 gallon corner aquarium and have been using Reef Crystals, doing a 20 gallon water change weekly. My water parameters are as follows:

Date
11/21/2020​
PH8.1
DKH8
Calcium412
Magnesium880
Salinity1.025
Phosphate0.24
Nitrate0
Nitrite0
Ammonia0
Temperature79.8

I have been trying to get the magnesium levels up, i have been putting in 25 ml of Fluval Sea mag every other day measuring on the off day I am guessing I have about 100 gallons of water including the sump. The container says it should provide 5mg/L per dose, I cant seem to get the mag levels to budge, starting to wonder if my Red Sea test kit is not working. Thoughts, maybe I just need to dose more.

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Doctorgori

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just one suggestion (you might get multiple good answers)
perhaps try Brightwells Kalk+2 ...I use it along with Tropic Marins Part-C ....may even be overkill ...been working tho
 

biophilia

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I can't speak to that specific magnesium product, but magnesium usually needs to be dosed in much higher volumes than you'd expect compared to products like 2 part solutions. 25ml feels pretty low to me for 100 gallons. For comparison, 12ml of Kent magnesium raises the Mg level of 10 gallons of water roughly 100ppm. If the Fluval mag is a similar concentration, you'd be looking at adding 120+ml just to get your Mg near 1000. I'd double check the dosing instructions (and also maybe reference a different test kit just to be sure).
 
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Chrisz

Chrisz

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It really seemed like a lot of mag I was using...I have some Kent Marine also, the directions say 1ml per gallon think I will give that one a try
 
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