Help with Snail ID

[kswan]

I have these snails reproducing in my sump. Haven’t seen any in the display yet. What are they? Potential problem? They seem to only have a half shell unlike most snails.

 

[WV Reefer]

I have these snails reproducing in my sump. Haven’t seen any in the display yet. What are they? Potential problem? They seem to only have a half shell unlike most snails.

Limpets.

 

[KrisReef]

Limpets, I have them in my skimmer. No problems so far.

 

[kswan]

Thanks for the help. Just did a little search and that is definitely it. Doesn’t seem like a problem. Suddenly have a bunch of micro brittle stars too. My CUC is getting more diverse.