Magnesium

[nathanemmerich]

What is the ideal level of magnesium? I see sea water is 1280ppm but when I search I see recommendations up to 1450ppm. What should I target?

 

[billdogg]

I try to keep mine at 1350

 

[thegrun]

+1, 1350, although there is nothing wrong with 1450. Some inverts struggle with levels over 1500

 

[nereefpat]

In addition, low Mg levels can make it difficult to keep Ca and alk up where they need to be.

Mg is consumed by our reefs, but very slowly, so you may not have to dose much. Mg can safely be kept artificially high (up to a point) without consequence, but low Mg can give you trouble.