We have a big meadow with lots of goldenrod, lythrum and other sturdy field weeds. Sometimes I save the roots because they're so intricate and woody, but I'm not sure what specific plant they're from. They look a lot like the wood being sold as bonsai for aquariums. If I sterilize the root by boiling, would they be safe to use to attach moss in the aquarium? I don't want them to leach anything toxic into the tank.