Small barnacles?

[Hilltho07]

They’re about the size of pencil lead and don’t seem to be hurting anything, but I’m curious as to what they are. Has anyone run into these before?

 

[Lovemyreef2015]

Those are vermetid snails. I see one with it's mucus trail. I would scrape them off

 

[WV Reefer]

They’re about the size of pencil lead and don’t seem to be hurting anything, but I’m curious as to what they are. Has anyone run into these before?

They are vermetid snails.