Dosing magnesium

reeftard31

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So I have a 21 gal tank and have never dosed mag before. I checked my levels and it’s appearing to show 450 ppm and that I need to add almost 2000 ml of EVS mag solution. I’m just wanting to make sure that sounds right or maybe I did the test wrong and there’s no way?
 

TX_REEF

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Are you sure mag is the only deficient component? I know @Randy Holmes-Farley advocates to not dose or test mag individually as a deficiency of mag generally indicates a deficiency of other components that can be better handled with a broader dosing solution?
 

gtguy256

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Check your salinity first. As mentioned above getting a Ca and ALK reading will help to determine how to correct any imbalance.
 

Randy Holmes-Farley

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It is likely you are reading it backwards, as often happens with Salifert.

Be sure that reading the table and syringe, if you dosed a full syringe to get to the color change endpoint, magnesium is high, not low.

A low level means you added very little from the syringe to get to the color change.
 
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