I have no luck with raising snails, none at all. I bought a 1.5 gal (it's a spongebob tank lol) and got 5 medium sized brown ramshorns from a friend. I thought they weren't looking so good so I put 3 in my puffer tank to be eaten and left the two that still seemed alive. And today I saw a baby snail! Woo hoo. This has all been rather frusterating for me lol.