Tiny Snails Good or Bad?

[hillegom]

I have lots of these for quite a long time. Never, in my estimation, too many.
They are part of a cleanup crew, but will happily munch on algae on my glass as well.
Could be unsightly to some, but I like them. lol

[toytech]

If there stuck on they can also be spiral worms , harmless little filter feeders.

[Mahawka]

they are not worms for sure. It's a shell.

Thanks for all the info. I will keep them in my tank.