Snail Hitchhiker ID help?

[MVsea1]

Noticed a few of these small guys on my rock..mostly come out at night. Started the tank with real ocean live rock from the Florida keys. Tried searching online to ID with no luck. Any ideas? Good guys or bad?

 

[EeyoreIsMySpiritAnimal]

Impossible to tell from those pics.
Pull one out and photograph it in a small container of tank water (under whites).

 

[kjkszpj9]

could be whelks which eat snails but cant tell much without seeing its head etc.

 

[Aiden22!]

Looks to be either a cerith or astrea ‍. Good news is that they are both reef safe!