New snail? Good or bad?

[sleeper]

I have noticed this guy a few times after the lights go out at night. I haven’t noticed him doing anything bad but I have no idea where he came from. I haven’t added anything lately. I have one Cerith snail, 3 Astrea snails, and 2 Nassarius snails. Im not sure how this could be a baby, so I’m leaning more towards a hitchhiker that I’m just now noticing. Thanks for the help.

 

[Crabs McJones]

I have noticed this guy a few times after the lights go out at night. I haven’t noticed him doing anything bad but I have no idea where he came from. I haven’t added anything lately. I have one Cerith snail, 3 Astrea snails, and 2 Nassarius snails. Im not sure how this could be a baby, so I’m leaning more towards a hitchhiker that I’m just now noticing. Thanks for the help.

Are you referring to the one on the same or the white one on the rock?

 

[Jose Mayo]

The snail that is on the rock is a Cerith sp, the other, on the sand, resembles a snail of the genus Stramonita sp. Some are bivalve predators.

http://www.gastropods.com/4/Shell_1904.shtml

Regards

 

[sleeper]

Looking to ID the one on the rock, the one on the sand is an old shell left over from what was sold to me as a Cerith snail.

 

[Yati]

I agree with @Jose Mayo and @sleeper looks like a cerith snail