Okay, a friend of mine wanted to get rid of a Blue Mystery Snail he's had for a couple weeks. He got it off of a clutch of eggs from someone. I picked up the snail from him, he bagged it as you would a fish, I brought it home, floated it for about an hour, slowly adding water from my tank into the bag. I take him out of the bag and he abruptly sinks to the bottom. Four hours later, he's still sitting in the same place in the bottom of the tank? My kids are asking if he's asleep or dead.... I don't know what to tell them. Any ideas, suggestions?