I have a blue mystery snail that's less than half full grown. Today it spent the whole day floating on the water, and kept getting caught in the water from the HOB filter and getting tossed around. It's alive, was all stretched out at times. I took it out and put it in a small plastic container with 1/4" of water and floated it - since it floated above water level, I could close the lid and hold it in place. It latched onto the bowl, so I added a little more water, then more, and it has been climbing all over. So I took it out and put it back in the tank and it went right back to floating. So as of now, it will be spending the night in the bowl. Does it have an air bubble trapped in its shell to make it buoyant? Is there anything I can do for it?