Crush them with the bottom of a jar, rinse off the shells, then feed. Try to avoid crushing snails with your fingers, they can carry a bacteria that will give you a nasty infection if you stab yourself with the shell.
so like crush them on a flat surface with a jar, wash off all parts of the shell and feed them to them also about how big should i let the snails get before they can be fed to my cichlid because for right now they are too small.
Probably a few weeks or a month.