It's been in this rock for quite awhile now. I do think it may be getting bigger, but it's hard to tell because I have never seen it any further out of the hole in the rock than what you see in the pictures. It seems to have a single silk-like filament that I think it uses to catch and reel-in anything that touches it. The filament is about 6 inches long and nearly transparent. Today, I was using a turkey baster to remove the shed off my Nepenthe tree and it caught a piece of the shed as it was blowing around in the tank. That's when I noticed it, because it was eating the piece of shed. Sorry the pictures/video aren't any better. And this thing is only about 3mm in diameter, so it's pretty small. I was zoomed in pretty far. Oh yeah, and it survived a heavy dose of H2O2 a while ago, too. Thanks in advance for your help!