An unknown hitchhiker makes an appearance

[PDXJonathan]

Hi guys,

 

I'm in the cycling process of setting up my Spec V. My live rock is Reel Reef that had previously cycled in my LFS's system. I'm about 6 days in at the moment and today I saw this guy "slugging" around on my live rock. Sorry about the bad angle, by the time I got my camera he was going into hiding.

 

 

At first he looked like a clear rollypolly, but after more inspection he had a slug like bottom (and not legs) and two antennae looking things on his head. Is it possible that it's a Siliceous sponge?

 

Thanks for the help in ID'ing!

[TJ_Burton]

Hard to see, but I'd guess Stomatella snail.

[PDXJonathan]

That's it! The photos are exactly what he looks like. Thanks so much!!