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Chances are they are li'l old pond snails, they reproduce asexually so it only takes one to reproduce and they are a pest once you have 200 of them, so I would give them a kick
It doesn't look like a pond snail all the pics I seen on google they all had a long sorta pointy shell these ones just have round shells and like a leopard print style thing on there shells
It's a ramshorn snail. They dont reproduce as quickly as pond snails and tend to be a bit more popular. But from what I've heard they can eat plants so I remove them from my tank with extreme prejudice.