Advice: White dots in driftwood.It's nothing to worry about , quite common in new driftwood. It's the start of a fungus outbreak on the wood. The will eventually turn in a white fluffy material then die off. It's caused by some organics in the wood decomposing. Pointless to scrub off as it will just keep coming back until the decomposing cycle is finished. It'll clear up by itself in a few weeks. It's completely harmless to plants and fish and won't spread beyond the wood. It'll just look a big ugly until it burns out.