I keep a piece of driftwood in most of my tanks,
My driftwood always comes from Salted water,
All I do is wash/scrub it really good under hot water,
Let it dry in the sun a few days, Then weight it down with a piece of rock or 2 or 3 collected from the seashore too.
After just a few weeks most I was able to remove the rocks and the log stayed in place in the tank.
Always in NEED & looking for more Tanks!