Mystery snails will occasionally go up to the top of the water and extend their siphon above the water line for air. They can stay under water for a really long time without doing this, though.
I find snails extremely entertaining and endearing. Last night I dropped a green bean into Floyds tank, and the snail found it quickly. There she was, holding the been with her foot and rolling back and forth nibbling on it. She reminded me of a baby with its bottle.
All my snails have grown quite a bit since I got them, and their new shells look so much better than the old; more color, more defined lines, no errosion at the edges. I think this is due to the turtle/aquatic frog sticks I feed them (lots of
calcium there). Schultz has almost doubled his size already!
S.