Good or Bad? please ID

[P-Nut]

I just saw this guy.

I have other similar snails, but they are black. All my live rock came from a fellow Boston reefer that had his tank for over 3 years and it was really ncie and clean. Maybe this is a baby from those?

so, is it good or bad?

 

[SteelerMike]

The picture on the right looks like a nerite snail to me.

 

[beelezebubba]

2nd that. i'm assuming the first is just distorted from taking the pic through the glass at an angle.

 

[THE WOOKIE]

keep a eye on them. most likely they are harmless if they came from a established tank

 

[P-Nut]

keep a eye on them. most likely they are harmless if they came from a established tank

The others are 3-4 times its size and they are never around the coral. I just saw that little guy yesterday.