Hitchhikers on coral

[SaltyFoxfish]

I need to get some soft coals into a business tank, but found these guys on it. Can I get an ID so I know if it's safe? I'm on a time limit for working.

 

[SaltyFoxfish]

Best I can get

 

[SaltyFoxfish]

Figured it out- chitons. Never seen them in person before!