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It depends on what you can ridiculously high pH. Peat and driftwood will lower your pH while not adding any buffering capacity.
I think you would probably want to add baking soda (I will defer to the experts as to how much) but this way you can accurately control your KH and help prevent pH swings without making the pH too high because you can control how much you put in. Some people have also used a small bag of crushed coral or something like that, or some sea shells that will slowly dissolve, but it's harder to control than something you add like baking soda.
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