Snail ID?

[OneReef]

Can anyone ID this snail? I did a Coral Rx dip of an acro that had a bare spot on it, and a rock with some zoas on it that were dieing off. There were lots of these little tiny snails after the dip left in the bucket. (there are a few things in the pic, but you can see the snail)

 

[geemanaz]

It look like a Collonista Snail

 

[OneReef]

It look like a Collonista Snail

cool, thanks. Google says they are harmless grazers....