My whole tank has these things, I know generally they aren't a problem, but over the last 3-4 weeks (maybe less, just don't want to over exaggerate) it went from none, to this. Should I leave them? Keep an eye on them? Disregard? Is it even as wild as I think it is? All the way around the base, and on the plug. Even the bit that's stuck into the rock work and when I picked it up there's so many worms that have built on top of each other it feels crumbly and grainy.
