Hello, I got a new Mystery Snail from my pet store because I thought they looked cute. I put it in my tank and accumulated it even though the store said it wasn't that important, and then I put him in the tank. I haven't seen him come out of his shell much at all, so I looked up some stuff and thought maybe he was stuck. So I try to put him flat on the ground or on a decoration, but he keeps floating a little bit sideways but not enough to go up the tank much. Any help?