Size of the tank? You could always look for realistic yet fake wood ornaments, unless you are wanting it for plecos/ph buffering.
I have a medium sized piece in one of my 55's, it's been about two weeks/two water changes and there dosen't seem to be any tannins left...I only soaked it for a few hours too. I have two larger pieces from a different source in a 65g though at work, and those are still leaching tannins two months later.
I have a medium sized piece in one of my 55's, it's been about two weeks/two water changes and there dosen't seem to be any tannins left...I only soaked it for a few hours too. I have two larger pieces from a different source in a 65g though at work, and those are still leaching tannins two months later.