How do I get my calcium down ?????

[btkrausen]

What are you using to dose Mag? Ideally you want your magnesium to be around 1400 but only want to increase by 100ppm a day at a max.

 

[Anthony Calfo]

the old adage "dilution is the solution to pollution" is appropriate here as well, if the Ca is exceedingly high. A single large water change rights the ship when things stray, then you can resume reliable supplementing (indeed, the 2-part RHF suggestion is a very good one).

 

[Pellaeon]

I was using BA Magnesion, I am now using BA reefbuilder.