09-09-2009, 05:24 PM
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If you have reason to think it might be the wood, I would remove it for a week minimum, do a pwc when you do, and see what happens. Put in something else for a hideout (another bit of wood, rock, clean flowerpot on its side...).
Keep the wood you take out in water, a spare tank or a pail, just so it doesn't dry out, in case it's OK and needs to go back. You may be right, wood can contain any number of substances, and it may take some time before they begin to leech out; I speak from terrible experience.
This other thought for what it's worth--Is the substrate the same as in another tank with no problem? My tank with the darker gravel I have always take longer to settle than the others, whether a new setup or a pwc.