I would never do it on purpose. But once while moving some rocks around and not realizing the feather duster had attached to two rocks, I ended up pulling him out of his tube. I was sure he was going to die as the tube was ruined. I only had one peaceful fish in the tank with it. After not too long he rebuilt the tube or another tube and is now doing fine! He looked like a big fat red earth worm out of his tube, very strange looking.