I have something growing in my freshwater 29gallon tank. There is nothing in the tank but a few shrimp pellets, gravel and laterite substrate, and this one piece of driftwood I got from my LFS, where it was sitting in one of his tanks for a few days. It is white and semi-leafy and has a fuzzy quality to it. The tank has not cycled, there is no ammonia or nitrites yet. I can't quite tell what it is, why it is there, or how to get rid of it short of scrubbing it off. I have not yet messed with it so I don't know how it will react to scrubbing.

Will post picture in a few.