Are these pests?

[Stickboy97]

Just bought a new bi-color torch (Euphyllia) and when I got it home to acclimate & dip I found these on the stems. Are these bugs? They don't scrape off and didn't come off with a dip.

 

[fishkeeprian]

Just bought a new bi-color torch (Euphyllia) and when I got it home to acclimate & dip I found these on the stems. Are these bugs? They don't scrape off and didn't come off with a dip.
View attachment 370854

View attachment 370855

These look like vermetid snails. They can be a pest when they are feeding, they let off a stringy mucus which can irratate corals.