Is this a new tank? You can carefully pull them off, put them in a bag and ship them to me!!! Seriously though, they tend to reproduce in cycles. Chances are they will die down quite a bit. You do not want to get rid of them. To most, they are one of the most valuable CUC members. Do you see them in broad daylight? If so, you may have some serious water quality issues. Otherwise, just let 'em be.
what is CUC members? I got this tank for 5 months. I bring water simple to get free testing in the fish shop. No problem found. Should I get some kind of testing kit?
I see the snail in daylight also.
Thanks
CUC = Clean Up Crew
Having test kits for at least the basic parameters is always a good idea. But like PEZenfuego said, stomatella snails are a good thing to have.
If you take pull them off, they detach their tails. Kinda freaky lol. There are probably a ton of them, but once your tank matures, it should die down. Right now there just aren't enough limiting factors for them.