Unless you're way under stocked you should be changing more than just 10 gallons for the sake of the fish. 20-25 gallons would be ideal and it will remove the tannins faster.
I soaked my driftwood in a bucket for two weeks, adding hot water and changing as the water stained. After the staining was minimal at 12 hours I boiled the piece for about 12 hours over the course of two evenings, changing the water as it stained. My water remained clear and my pH remained stable.
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