| | Re: GH and KH issues
You definitely have very hard water with TDS 700-1000.
I looked up Montana and looks like you're sitting on top of shale, could be CaCO3.
Most aquatic plants usually do a lot better in softer water. Try anubias, java fern, and Vallisneria in hard water.
GH only measure Ca & Mg... There are lots of minerals that a GH kit can't measure.