Which snail? Good or bad?

[kzaveri19]

Got this as a hitchhiker on a colony. Please identify. Good or bad ?

 

[Crabs McJones]

Looks like a mexican turbo snail. Good thing!

 

[kzaveri19]

Thank you !

 

[danemma]

What are the white circle things on the shell as I've got a few on my live rocks anything to worry about or sump it tobe safe?

 

[Maritimer]

Those look like little spirorbid worms. Harmless filter-feeders, but feel free to scrape 'em off your front glass if they're blocking the view!

~Bruce

 

[bknope]

What are the white circle things on the shell as I've got a few on my live rocks anything to worry about or sump it tobe safe?

Looks like spirorbid worms to me. They are good filter feeders. Like small feather dusters

 

[danemma]

Thank you was getting worried but there safe and got lots of them too