when my tank's levels were way outa whack (6.0 dkh and 330 calcium) I dosed baked baking soda and quick kalk over the course of a week to get it back on track. Needed almost 1/2 a cup of each to correct it.
Don't know how to correct the magnesium though, as I use a salt that's super high in Mg already.
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Everything I put in my tank is fully dependant on me.
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