Magnesium issue
 

I can't seem to get my magnesium level past 1200!
Everything else is fine
Alk:8.36 (Hanna test kit)
Calcium:430(Hanna test kit)
Mag:1200 (Nyos test kit)

I have been adding seachem advance mag on a weekly basis.
I do not use kalk as I read that it can affect the magnesium.
Any advice would be greatly appreciated.

Test kit issue? Not adding enough quantity? Just my thoughts.

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Add more, or don't worry about it. 2 options.

It takes lots to raise mag

You probably aren't adding enough. Use a reef calculator (Google has lots of 'em).

Seachem has their own on their site. I always choke when I see the amount :)

IMO Mg is dumb anyway, my tanks have always run at 1150 or less. Couldn't even buy Mg when I started in the hobby, everyone's tank did fine. Buy beer instead.

Patpare,

Did you recently do a water change?

Yes I did at 12.5% (5gallon) 4hrs befor I tested my water.
I have been adding up to 1 1/4cups of seachem advance mag per week for the past month.
I should mention that my tank is sps dominant.

What's the volume of your tank? Which salt are you using?

For example; IO is around 1100 ppm, so every time you do a water change you're going backwards unless you add Mg to the freshly mixed saltwater.

My system has a total volume of 40gallons.
I use reef crystal for my salt!
I used to use reefers best salt,best salt I've ever used but now I'm on a tight budget.