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Hydrochloric Acid or Another way of Lowering pH

I remembered that someone had mentioned using Muratic (Hydrochloric Acid) to
lower pH. I believe it was Wright. Where do I get this acid and how to I add
it? I have tried peat, pH down, CO2 injection, adding about 10 gallons of RO
water to my 100 gallon tank (making it 90 gallons of tap water and 10 gallons
of RO water), and none have worked. I might see a drop of .1 or so but by the
next day, it is gone. I have a pH of 7.4 and I need it around 6.8. My fish
start losing color when the water is alkaline. Does anyone have a way of
lowering pH?