I just got a mystery snail two days ago and I put him on a rock in the tank after acclimating. He wasn't moving around in the bag, or the tank. But I think a little baby snail popped out of it or something because a little snail appeared in the bag a few minutes later. The fish keep tipping him over and he just sits on his back sometimes. Some weird white stuff started coming out of him today. What does this mean?