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Discussion Starter · #1 ·
Just out of curiosity, what's the typical amount of magnesium (in ppm) in a tank that is at 12 dH?
 

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Discussion Starter · #3 ·
Okay, I need ppm and 20 ppm of Mg sounds a little low for an aquarium at 12 dH. That site provided information on drinking water, not aquarium water to maintain water hardness.
 
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