Snail ID

[FishyFishy!]

I have noticed a lot of eggs all over the glass lately. Today I noticed two different kinds of very tiny snails.

This one almost looks like a sundail snail.... But i'm not sure how to clarify. He was found nowhere near any zoas.





Also found a few of these guys. They have what looks to be a tube in the front. I thought they may be baby nassarius, but after some research, they are extremely rare to breed in an artificial habitat.





Anything I need to worry about??