Originally Posted by mistergreen
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.
Thank you. Other people have told me I have soft water so I was very confused what fish I should be looking for. So I should stay away from the tetras that don't do well in hard water, correct? Livebearers would do well, etc.