Snail id

[dirk33]

Found this guy on my rock, he is a hitchhiker as I've added nothing but rock and sand at this point. He's really small maybe 1/8". Wasn't able to I'd him using the hitchhiker guide so what do you guys think. Picture is a little blurry. Sorry

 

[Petrichor]

Possibly a collonista snail. They don't get much bigger than that and are algae grazers.