Peat, leaf litter, and driftwood won't alter your water much if it has a high buffering capacity. What are the gH and kH? If you're using Florida tap water I'm guessing it's moderate to hard, so peat and driftwood won't do anything unless you run it through RO.
GH is 7 and KH is 9.
I wouldn't need it to go down much. The tap naturally settles to a pH of 7.4, so I would be perfectly happy if I could get it to drop to 7.0.
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