Tiny snail good or bad?

[Robbie_Maxwell]

Hi guys. got some live rock few weeks ago and tbh ive just left it in the tank and haven’t Done much with it since there is no livestock so ignore the algae lol but today ive spotted 2 tiny snails. I could only get a picture of one as the other was hard to see. Both had similar coloration but one had a ‘needle’ shaped shell and the other is the one in the picture. Anyway my question is are they sundial snails? Thanks in advance

 

[Lovemyreef2015]

Hard to tell from the picture. Looks like a Cerithium Punctatum from what I can see in the picture. They do not look like sundial snails.

 

[Robbie_Maxwell]

Ya sorry for the quality buts thats the best i could do. Should I keep them or remove them? Thanks

 

[Lovemyreef2015]

Assuming my ID is correct, they are from the cerith family. Detrivores and herbivores so I'd keep them.

 

[Robbie_Maxwell]

Thanks for the help.