I cant remember where I read it, but I know it was a few years ago. There was a guy that would frag polyps or zenia to empty snails shell, then he would put them in his tank with hermits. Some of the hermits would change shells and walk around with the polyps. I knew he was selling them, but at the time I did not have a sw tank. I was in the research phase of my reef set...an neverending phase...but I remember that I thought it was cool. I would imagine that the shells would get heavy eventually and they would change shells. I never heard about it again. this post just reminded me of it.
