@Stefan3289 You can take a pond snail back, but it is only the one you see. others will appear. Unless you treat arriving plants, they always come along, usually as eggs.
I don't mind the ramshorn snails
@Bubble the Guppy has. They will tell you if you are overfeeding by reproducing madly, and are harmless. Pond snails are a different story. They eat fish eggs, which is a problem for me as a fish breeder. They can keep fry levels at zero, as they are very resourceful predators. They don't bother fish - just eggs .I put a net hard against the glass and squish them, so they fall into the net and don't add ammonia. In tight spaces, a turkey baster will remove crushed snails. It is one of my least favourite chores, but it works as long as you aren't grossed out and as long as you never give up. There are always survivors, but in time if you keep getting al the breeding age ones, you'll be ready for the next arrival.
Here I can't sound good, as a snail crushing know it all - but as an experienced aquarist, I only get "outbreaks" in heavily fed fry tanks. In regular tanks, I get a few ramshorns lurking in the background. Why? Becauae I don't overfeed. If you have a lot of snails, that's what you have to work on.