low magnesium, high calcium

[michelo]

I have magnesium in 820ppm( I throw daily magnesium tropic marin) and I want it to raise until 1300ppm, but whenever I throw magnesium now raises to the calcium and this in 490mg/l... that I can make to raise magnesium and that does not raise calcium...

 

[Randy Holmes-Farley]

I'm not sure why you saw a calcium effect, but if you use a supplement such as ESV or Kent's magnesium supplements, it will not impact calcium.

You will need a huge amount.

This calculator shows how much:

Reef chemicals calculator
http://home.comcast.net/~jdieck1/chem_calc3.html

and this article may be useful:

Magnesium in Reef Aquaria
http://www.advancedaquarist.com/issues/oct2003/chem.htm

 

[michelo]

thanks Randy....

 

[Randy Holmes-Farley]

You're welcome.

Good luck.

 

[michelo]

calcium I have 490ppm and KH 14dkh and ph 8.4..is normal?only I am throwing magnesium to the aquarium..

 

[llamart]

That is a great article Randy. Last year my mag became very low and ultimatly I lost many organisms. To help, my LFS suggested I use Dolomite to my calcium reactor. Since then my mag level has been solid (or since i was able to bring the mag levels back up using epsom salts). But now I have a better understaing on why my alk has since been consistantly on the higher end of the desired range.

 

[Randy Holmes-Farley]

calcium I have 490ppm and KH 14dkh and ph 8.4..is normal?

That is fine, yes.

That is a great article Randy

Thanks.

Using a little less dolomite might allow the alk to decline if it is too high.