I'm not sure about this whole zing movement but I do know that if you have a dead snail one whiff will tell you! Sometimes my snail will close up and even float around for two or three days without opening. (I'm sure he eats at night because something is munching on the algae wafers! haha). He could just be getting used to your water conditions and temperature and all. Give him a few days and see if he'll calm down. 