Snails Good or Bad?

[Mastiffking]

Hello I found these little critters roaming my rock work. Are they a pest or beneficial to my reef?

 

[Mastiffking]

I also have a ton of these that come out when the up goes off.

 

[GSPClown94]

The one on the left is a Stomatella and will eat algae, they will regularly spawn in your aquarium. The one of the right looks like it might also be a Stomatella but not really sure.

 

[Mastiffking]

The one on the left is a Stomatella and will eat algae, they will regularly spawn in your aquarium. The one of the right looks like it might also be a Stomatella but not really sure.

Thank you for the reply and help.

 

[kevgib67]

Stomatellas are great hitchhikers, I didn’t have any so I purchased mine.