What Is This?

[Flyflicker]

Please tell me what this is? It has almost a straight shell on top the rest looks like a snail or slug, but this thing can move. It is a pretty fast mover compared to a slug or snail and it moves a little like a caterpiller.http://reefcentral.com/gallery/data/500/78908001.jpg

[capncapo]

It is a stomatella and YES, they can move!

It is a harmless type of snail that is a good algae grazer.

[Flyflicker]

Thanks. It is always good to know what you have in your tank.