Dropped some new wood into temporary tank to start it waterlogging the other day, and today, found a couple of the pieces like this I'm sure I've seen other people post about this happening on new wood in their tanks as well, and that's a harmless bacterial growth that will either go away on its own or can be rinsed off, but just wanted to double check before messing with it, given the amount of misinformation I've heard on the web. It looks sorta cool as well