I would physicly boil it so get a large pot and get the water boiling and put the wood in keeping the water boiling, doing that for around half an hour to an hour should do the trick.
I would make sure none of the white stuff is floating in the tank and possibly do a water change just to be sure. I didnt suffered ill affects when this happened to me, but I did do a large water change stait away.
I hope this helps, its a lovely looking piece though ?