My apple snails used to do that too, they always survived though, what they couldn't survive was my para plec , he cracked open all of ther shells and had a midnight snack(s)
Sorry about Gary
(reminds me of SpongeBobs snail named Gary....meeeow)
Maybe you can get another one and name him Larry ,remember the episode where he brought home the evil snail to replace Gary and it would hiss at him all the time :kira: :kira: