ID this refugium critter please

[Miamireefer]

About the size slightly over a nickel and slithers fast as hell.
Has what looks like comparable to extensions of a leather coral.

This guy roams between all 3 chambers of my sump /fuge but hasn't done any harm to anyone else which consists of 2 turbos, loads of copepods, and brine shrimp.

 

[Pico Keeper]

Sorta looks like a stomatella, but the pic isnt that clear. Does it look like a slug with half a snail shell on top?

 

[jessp]

i agree stomatella

 

[Miamireefer]

sure is...checked it out against other images from google and glad to know he is one of the most beneficial herbivores in a tank..

Thanks again guys,

Nick