Sounds like the drift wood hasnt finished leaching out the tannins. Theres no harm and some people (myself included) like the colour.
You can use carbon in the filters for a while and clear the water or soak the driftwood in bleachy water for a day or two, rinse extermly well and let it sit in the sun to dry.
If it didnt discolour the other tank then it sounds like it wont be too long b4 the tank clears,if you do nothing.
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TONY
Australian and proud of it!! My Cichlidfish.com Home page