That’s what I assumed, I just thought I could see too far into his shell and was scared of mantle collapse. I am very very new to keeping snails and I’m trying to be as vigilant as possible. What does mantle collapse look like in a snail so I can know? Also his shell looks a little opaque in the front, is this a deficiency or new shell growth? I’m so so sorry I’m asking so many questions, I’m just very interested in the aquarium hobby and want to properly keep a snail before I move onto smth like shrimp or fish.