What do ramshorn snails eat?

Snails eat lots of vegetables like lettuce and are supposed to eat cuttle fish, this keeps their shell strong as they can be very delicate. It's like us drinking milk It has calcium to ake our bones strong. They also eat green plants(but if you get them yourselves they must be soaked overnight,to remove any nasty chemicals). They also eat bark and all the things on it. but you also have to keep them in a damp environmental.