ive had one snail for a while now that the pet store gave me on accident. i just got a new plant for my betta fish tank and i found 4 snails. thats understandable they were probably in the new plant. however i have added no new plants to my tank that had one snail...now i count 13 snails and i have no idea where they came from. ive had this tank for about 4 months now so im just confused how they got here. im in the process of moving the snails so i can count them.