Indeed they are 'bubble' snails (Physidae, most likely Physella acuta). They are sinistral (left coiled). Harmless to your tank but somewhat of a nuisance.
Some fish would eat them, and some snails ('Assassin snails') would too, as well as some shrimp. However, I wouldn't add them for just that purpose. You can trap the the snails repeatedly, and over time, if combined with reducing over-feeding, population may decline.
One can also crush them and about any fish (not just snail eaters) will then eat them. However, don't do it with your fingers as they usually carry nasty parasites that can enter through minute injuries on hands (use something flat against the glass). Good luck!