Fast slig.

[XNavyDiver]

Took this vid just a few moments ago and it's the first I've seen of this little critter. Looks harmless. Is it a stomatella?
Edit: meant to type SLUG.

 

[reef lover]

Yup...good guy

 

[TheEngineer]

It could be a stomatella. They move pretty quickly for snails. The ones I've seen have either dark black or brown shells. The shell is really small by comparison to the snail and it can't fit inside it.

 

[XNavyDiver]

It could be a stomatella. They move pretty quickly for snails. The ones I've seen have either dark black or brown shells. The shell is really small by comparison to the snail and it can't fit inside it.

Yep. You described it to a tee.

 

[TheEngineer]

Yep. You described it to a tee.

Nice! They’re awesome algae eaters and they multiply readily in our tanks.