drift wood is called drift wood cause it floats???
get a piece of flagstone from a rock quarry. Place it on top of the driftwood and keep it there for 3 weeks and then check it or if you want check it once a week. There are different kinds of driftwood. Malaysian, Mopan I can’t think of any others right now. Cedar has lots of oils in it, I would not think it would be fish safe in a closed environment.
Some will float basically forever. You should look into using aquarium safe silicon. You could use it to attach it to the bottom of the tank or a rock.
well whar i red in a book once that said you need a bucket that can hold the wood and tie some fish line to a rock and then to the drift wood and then let soak for two weeks and change the water everyother day.
The book is called My Guppy