ID tiny white snail with brown stripes

[stanleo]

Looking in the tank at night I found these all over the rocks. Nowhere near the corals just on the rocks. I'm thinking they are good guys but I do like knowing what the little critters are. Anyone hazard a guess? I have other pics but I think this is the best one. They do move on their own.

 

[stanleo]

Never mind, I think I found them. Collonista snail and they are good guys. Algae grazers. I think I saw like twenty or so.

 

[Fam5dad]

I have them you and you helped me ID them. Thanks! Now to read up on them...