I have NO idea what happened. I was at my dorm for a week and my 5 gallon tank was under the care of my mom and friend. My mom had been panicking because she couldnt tell if my snail, Phleb, was dead but I figured it was just him asleep. When I came back his shell was extremely damaged at the edge but there is not evidence of pieces in the tank. I moved him to a 1.5 gallon QT tank and I have no idea what to do. I don't think he'd dead because he moved a little more into what's left of his shell between the move. Please tell me how or if I can fix this!