Question about magnesium

[SirKevinD]

So I have been testing weekly and noticed that each time I do a water change I significantly remove a portion of my magnesium but not KH or CALC. Why does MAG leave with a water chicane but not the others? Is this normal?

 

[wuuzzzuuppp]

The salt you are using is probably replenishing you KH and Calc, but is falling short on you Mag.

 

[KoleTang]

The salt you are using is probably replenishing you KH and Calc, but is falling short on you Mag.

+1.

What brand are you using?

 

[Reefing Madness]

The salt you are using is probably replenishing you KH and Calc, but is falling short on you Mag.

+1 ^^

 

[DaveMorris]

I would also test the new water before doing the water change and if it doesn't match the tank parameters, add supplements to get it there. If you do this before doing the water change you won't see that difference in the tank.