05-01-2010, 11:16 AM
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It's normal for driftwood to release tanins into the water, causing it to have a yellow tinge. Driftwood should be cured by boiling it for hours at a time, several times to avoid the yellowing.
Adding activated carbon to your tank and changing it frequently can help, as do frequent and large water changes. However, without actually curing driftwood, the yellow water can last several months.
There is nothing bad for the fish, by the way, and some people love the look of the more natural-looking water.