how to check Mg

[zapata41]

ok i dont have a mg test kit and want to know how to test for it.
my water is as follows, Ca 460, alk 10.36, salinity 1.025~, everything else in check. so hiow do i figure out my Mg, i also wanted to ask about the use of epson salt for raising Mg, the search funstion is down so i cant search for it there. i have a 55g, lps and softies.

Thanks
Tim

[Randy Holmes-Farley]

You need to get a magnesium kit to test for magnesium. I do not know of any other way.

Epsom salts (magnesium sulfate) can be used for a small magnesium boost, but regular use is not recommended as it will boost sulfate too much.

These articles have more details:

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

Magnesium and Strontium in Limewater
http://www.advancedaquarist.com/issues/dec2003/chem.htm

[zapata41]

thanx will have to find a Mg test kit then

[Randy Holmes-Farley]

You're welcome.

Happy reefing. :)