magnesium uptake in sps tank

[whatcaneyedo]

Not nearly as quickly as it will consume calcium and alkalinity. Water changes might be able to keep up. If not, the cheapest way to boost it is to use magnesium salts.

[chris88]

I can't remember the exact number but there is data on reef central saying its something like 1ppm for every 20ppm of calcium. I am guessing but it is close to that. Let me know if you find it again i'm also curious.

[trilinearmipmap]

I use the same media and every month or so I have to add 1/4 to 1/2 cup of Epsom salts to keep my Mg level up.

[H2o2]

jl also sells zeovit mag roc that i put in my cal. reactor at 10% like recomended and it sure helps me

[Willito]

IME, once your tank is stable and assuming all 3 levels are near NSW, magnesium will deplete at a rate of 1:2 in reference to CA and ALK. In my tank, the magnesium is the most stable element of the three, it's solid. As for the Zeo Mag, I think this product is junk unless you have a CA reactor and willing to measure it constantly. Better off using mag in bulk chem for accuracy and economically.

[Lampshade]

ARM's new mix is "high magnesium" but still not perfect. I dose extra on water changes with Randy's DIY recipie. Apperently Dolomite(Dolcimite?) in the calc reactor works, people have been using that for a long time.

Check salt mixes too, i use IO and it's low. Just bringing it up to 1300 at water changes keeps my tank balanced at about 1200-1250.