I think the bark will come off eventually if you put it in the tank. It also helps it get water logged faster.I have a stupid question. Do you need to debark it? Why? Just curious. I have some really nice small oak branches. The branches are actually long, about 4feet, but they are really thin. I don't know if I can get all of the bark off, so I haven't used it. It would look so awesome in my tank, but I don't want water quality problems either.