I'm searching for a few small pieces of "well" aged driftwood for a 20long. By well aged, I mean they can no longer be releasing tannins. As much as I love tannins and all, they have be purged completely.
If you cant find any you can just boil the tannins out... thats what I did at least 5 or 6 boils for 5 mins or so and mine was almost totally free of tannins