The Planted Tank Forum - View Single Post - Which Water to Use?
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Old 01-30-2013, 03:48 AM   #17
Cthulhu
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I'm going in this direction too...
I already have a RO/DI unit, automated water changes / fertilizers / additives, and eventually I want to keep discus. So I will use RO water and keep a low PH and KH, and aim for 5 GH.

But I wonder abou 0 KH... Common saying is that some KH is necessary to keep pH stable. But I'm reading more and more about people who keep 0 KH and it works well.

So it's the only thinkg I'm not sure about. Should I add something to get my KH to 2? Or keep it at 0?

I'll probably try it with 0 KH, I think stability is the key there, and with everything automated it should be stable enough.
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