I have had that on my driftwood too, and it eventually went away. You could probably just scrub it off occasionally until it goes away! I don't think it's harmful
its a bacteria from what ive read, almost like an algae? shrimp or snails would eat it but its not harmful.... just ugly (i have a clump of this in my tank now too, its gross so i try and suck it off the wood when i do water changes)
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