snails need chalk from the ground ie. found in stones or other minerals. scientists have also believed that you can feed snails children's chalk as it is nearly the same!!!
I have never heard of water snails eating chalk, i just go to the pet store and get some algae wafers
Because it has materials snails need.
i think that they dont
No toads don't eat snail shells in fact it's quite bad for them.
The snail will still grow even though it lives in an aquarium, so yes the snail will out grow it's current shell and need a new one.