A couple mmonths ago baby snails hitched in on live plants, I soaked the plants in tap water for a day and did a search with a light and got them all off. I wish I didn't now bc I obtained some with my assassin snails and keeping them in a separate tank and I LOVE THEM!! They're little suckers but they clean up algae real fast! (but they poop a lot) Mine are regular pondsnails but the other common plant hitcher is ramshorn. They shouldn't eat live plants, they'll consume the dead parts and you can supplement it with spinach/green lettuce or algae wafers. If they ever did become a problem you could pick up an assassin snail (they control other snail populations) or a clown loach. :) Good luck! And don't rush in and kill them yet!
Well I originally have a cabomba but removed it due to disease. But what gets me wondering is that they showed up shortly after I tried feeding my guy some live brine shrimp, which in the pet store was right beside a tank of live "mystery snails" aka apple snails.
Eep!! Sorry! Didn't know about the clownloach group thing. And I'm so naive, only ever seen small loaches, the size of cory catfish.
And assassin snails stink like eggs after they eat.. -_-" they're messy.