My wood was in a Amazon biotope with blackwater extract added, so It didn't matter at that point, cause extract made it even darker. Now it is in my planted tank, and my one 55 gallon. It no longer releases tanins.
There is filter media that adsorbs tannins, it is like a chem zorb, but works like a carbon and mainly adsorbs discoloration in the water, that carbon wont touch..It is quite expensive ,however. But if you don't like the slightly tan look, it would work.
