It's a good guy, alright. I wish you had flipped him over so we could see his operculum... If it has a hard, shelly operc with the dent or "pinhole" in the middle, it's a Collonista species, or at least one of the species in the same subfamily.
If it has a thin, translucent yellow operc, it will be a trochid. From the single view, it looks like it could be a baby in the subfamily Stomatellinae...not necessarily the usual Stomatellas you see daily on Reef Central, but one of the species that looks more typical for snails in the Trochidae family.
It's similar to some variations of Synaptocochlea concinna (which are similar to the other Synaptocochlea species).
http://www.gastropods.com/2/Shell_6762.html
The shells shown in the above link were between 3 and 4mm, itty bitty guys. I wish now that I had included shots with better views of the spire, but alas, I didn't, and the shells are buried somewhere in my boxes labelled "Trochidae." You can probably see the similarities in shape and pattern, though.
If you can get a pic of the aperture, I can probably confirm the ID for you, at least to the genus level.
Cheers,
Don