Keep in mind that snails poop a lot, and IME should be removed from the tank for feedings, otherwise the betta will eat all the snail's food.
I had nerites, they dont get too big, theyre easy to find IME, and they cannot reproduce in fresh water. If you get two of the opposite sex, they can lay eggs, but they will never hatch.
IMO snails are more trouble than theyre worth. They are very cute tho ;)
Some people talk to animals. Not many listen though. That's the problem.
― A.A. Milne
Espeon female halfmoon / 10G
Jolteon male dumbo plakat / 10G