Slug hitchhikers? Help with ID

[SuperOstrich]

So I found 4 of these on a piece of branch rock that a new piece of xenia come attached to. I wasn't sure what they were or if they were safe, so I removed them from the rock and kept them separate until I could get a positive ID.

They have a small hard shell on the back, but not like a snail shell where they can retreat into it. They are all about 1cm in length, perhaps a bit longer when extended like in this photo. I tried searching for some IDs but couldn't find anything conclusive. Thanks for any help!

 

[Fluid]

Looks like:

Stomatella Snails (Stomatella varia) â€"œ This snail is typically not purchased yet a very common and very prolific hitch hiker. The Stomatella is fast moving compared to other snails and has only a very small shell in comparison to others. Almost any reefer that has purchased an amount of liverock and gazed at their tank at night has noted an abundance of Stomatella Snails that they have never seen before, as this is a nocturnal herbivore. Due to their rapid reproduction, some people consider there a nuisance and they can be but fear not, there are many other reefers that would love to have a few if your willing to catch them and take them to local club meetings.

 

[reefman30]

+1 Stomatella Snails algae eater. Wish I had some

 

[SuperOstrich]

Awesome, thanks a lot. That looks exactly right.

 

[Tylt33]

Stomatella, very cool and helpful.