You will have to slowly simmer the wood slowly
for a couple days to pull out some
of the tannins.
- Post a picture of the wood itself. Certain types will take longer to treat than others & some of the ones used in reptile tanks are the worst
You have to be patient with the treatment otherwise you can be dealing with unwanted color changes in your tank for a very long time.
The only thing you can do now is REMOVE the wood & change out all the water.