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I have bleach dipped driftwood before to deal with algae, just plugged and filled the utility sink with tap, added bleach, stirred and put in wood. After a 30 minute soak I rinsed thoroughly then boiled for several hours (changing boil water every hour) to make sure it was safe before going back into the tank. Note bleaching may discolor wood (lighten in). If you monitor it close its also possible to bake the driftwood in the oven at a very low temp (i did it for 5 hours at 170). Boil after to re-water log