Found a couple of these long yellow tentacle hitch hikers in my lr. Please help me ID it and see if they're beneficial or bad. I see a couple of long yellow arms poking out of the lr. Every time i try to pick a piece of its tentacle off with a tweezer it goes back inside the rock. Ill attach some pictures of this nasty looking thing. It doesn't look like anything i've ever seen. Has a TON of little yellow tentacles connected to it's body.