So recently I've realized i have tons of bristle worms in my 30 gal saltwater reek tank. Which totally freak me out NOW i find this crazy thing with at LEAST 6 legs!!! I seems like its attached to a mushroom on a LR. Because everyday the mushroom seems to shift more to the left. Then I tried to get it and it pulled all its legs inside behind the mushroom... Right now its hiding so i cant get a pic... Any ideas?