I used to have a Ramshorn Snail in my little tank. This happened just after I had done a partial water change. I kept a little aquarium salt in my aquarium. I put the salt in a cup in the water so it would diffuse slowly and not shock the fish or anything. Well, my Ramshorn was a very curious. He decided to go into the cup where the salt was. When I woke up I noticed him in there, and took him out right away. Too late...he was shriveled way back into his shell. I tried putting him into water with no salt for a couple days but nothing happened. That is the sad story of how curiosity salted the snail.