FranciscoB

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.…

How about one of the larger Hemiodus species ?
If introduced at a good size, they won't be eaten, won't damage plants, won't be aggressive, always swimming....
Below some of mine, which may be any of H. argenteus, H. orthonops, or H. unimaculatus. They are…