Overfeeding causes more, Pond Bladder an Ramshorns/ RH, and people with harder water and higher
TDS generally see more of them too.
They are good tank cleaners and I think they are pretty and fun tobm watch.
Probably RH from the one pic, hard to see them.
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New to FW fish? First tank in a long time or EVER??? Need some info on keeping fish?

Start here - Aquarium Advice Article
https://www.aquariumadvice.com/guide...ater-aquarium/
FW Favorites right now Clown Loaches, any shrimp - SW Vase Red Mangroves