I also had this problem recently,
but snails in the 100's lol.
They don't cause any problems being in the tank but they can get out of control really quickly.
I got an assassin snail first, i only got one to see how he got on, he defiantly munched on some of them but i would have needed an army of assassin's to keep the regular snails under control.
Then i decided to change from gravel to sand to keep my bottom feeders happy, this is when i realized just how many snails i had, the substrate swap got rid of most to them but they began to rapidly reproduce in the new setup.
A week or so ago i got 3 zebra loach, 24 hours later, the pest snails were extinct.
I haven't seen another since.
luckily my lone assassin snail was totally ignored by the loach for some reason.