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Re: Aquatic Plants Digest V3 #631
> In a tank designed to emulate an Amazon biotope, you might try mixing
> some dolomite into the substrate to supply Ca and Mg needs for Amazon
> swords. I would also recommend peat in the substrate of a Discus/Amazon
> tank to help supply humins.
Dolomite is highly soluble. It would not be long before your Amazon biotope
became a Tangyanikan biotope.
Last year my daughter and I used dolomite in a box filter to harden water as
part of a science fair project. 7 gallons went from 60 ppm to 150 ppm in less
than a week. That is a lot of hardness.