I have to disagree with that last post....I dumped about 7 empty shells in my tank for that reason, and have had one of my snails killed and had its shell repo'd. A day or two later, i found that same hermit all cozy in its brand new shell, going after another one of my snails....I had to take matters into my own hands (i am down a hermit now
)Just last night I found one of my hermits inside one of the empty shells I put in there. Its soo funny to watch because the shell is huge and it was on its side when he got in it and because it was soo tall, he couldn't move b/c his legs wouldn't reach the sand. I had to tip him over a little bit to help him out. Its still funny to watch b/c all you can see is this shell moving, you can't see him b/c the shell covers him. Not a dull moment in this tank!