Mg has not changed for 3 months without dosing

[jjencek]

I have been dosing Kh and Ca, but not Mg.

I do about 5% water changes (Red Sea Salt) every week or so.

My Mg stays the same for the last three months at 1360.

My Kh is 8.3 and Ca is 400. My tank is mostly SPS (acros).

Why is Mg stable without dosing?

 

[Gungo]

How much KH and CA are you dosing? If your demand is low that 5% weekly water change will maintain your levels of MG just fine.

 

[jjencek]

I have RedSea 350. I use Red Sea solutions (mixed from powder) and dose the following

Kh ... 90ml per day
Ca ... 20ml per day

 

[Timfish]

Well, in the scheme of things 3 months doesn't strike me as a very long time and I wouldn't stop monitoirng it.

 

[nereefpat]

Mg will be used no more than about 1/10th as much as Ca. It's likely being consumed at a rate that isn't detected by your kit. And, as stated, you are doing small water changes.

 

[elorablue]

My mg hasn’t changed in 6 months. Have never dosed it, weekly water change, reef crystals.

 

[jimk60]

My mg hasn’t changed in 6 months. Have never dosed it, weekly water change, reef crystals.

Reef crystals is fairly high in mag so you are actually dosing it.