I don't think adding peat will do anything to hardness....it just adds acids that may lower pH. You can get "pillows" that absorb hardness from the water....not sure how well they work or if they are a good idea, my water is 0 on both KH and GH so I don't have that problem. Why do you want to lower pH?
Edit: I looked up what information I could find, and evidently in addition to releasing humic acids (that lower pH) it can (depending on the source) also have the ability to do ion exchange and trap Ca and Mg ions by releasing a hydrogen ion. However, this would only affect GH, not KH, if this is correct information, as KH is a measure of carbonates, not calcium and magnesium. Removing Ca and Mg has no effect on pH.
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