How to deal with Snails?

How do I deal with snails- I think they're bladder snails? I didn't mean to get them they came in some plants I bought and there's suddenly LOADS.

I wasn't too concerned but then I saw a SWARM of them crowding around a food pellet for my shrimp. It feels like there's millions all of a sudden when I get my eye in ugh.

How do you deal with your snails? Should I just ignore them? Or get an assassin snail? I am then scared of the assassin snails getting out of hand too, or hurting my shrimp.