If you get the sandblasted manzanita, you just have to let it sink. I usually take a piece of tile or slate or something heavy, glue the end of the branch to it, and submerge it under the substrate. Even if you have the red bark, it will come off slowly and get eaten. What people do a lot of times is take natural rift wood with nasty critters and stuff that in their tank, which transfers bacteria and disease.
Basically, BnB is super safe wood. Don't worry about it too much.
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