Spines coming out of driftwood?!
Over the past week I noticed some bluish, white spines coming out of my driftwood. It seems to be growing out of the end of the driftwood. I've attached a picture (apologies as it was hard to get a sharp, focused shot).
Any ideas what this could be? Is it harmful and should I try to remove it? The fish/snails haven't noticed or bothered with it.