How can I not need to dose mag

[jimk60]

I'm dosing kalk with an ato and my alk and calcium are maintaing the parameters I want.
My mag levels are mantaining 1500 or so for several months even though I haven't added any.
Is this possible,? Corals look good and coralline is growing.

 

[tbrown]

Are you using rodi? Source water could have magnesium in it.

 

[jimk60]

Yes, rodi with reef crystal salt and a red Sea test kit.

 

[blasterman]

If you are maintaining calcium with kalc even conservative water changes will keep mag at the right levels.

 

[Randy Holmes-Farley Verified Community Expert]

The demand for magnesium is always very low (less than 1/10th of the calcium demand, often less than 1 ppm per day), and your salt mix obviously starts very high (what mix?).

You may never need any (if your magnesium measurement is correct).

 

[jimk60]

The demand for magnesium is always very low (less than 1/10th of the calcium demand, often less than 1 ppm per day), and your salt mix obviously starts very high (what mix?).

You may never need any (if your magnesium measurement is correct).

I understand that reef crystals is relatively high in mag. I guess I'll go with that. Thanks.