Driftwood, in my opinion, isn't the best thing to add to a saltwater aquarium because your pH will fluctuate a bit. Naturally, driftwood has an acidic pH because of it's origins.
However, most of my tanks run at 7.6 to 7.8 pH anyway, so... do your thing, whatever you think you would want to do. If it doesn't work out, then take it out.