~1" long blue thread

[PsiStar]

It was too quick to get a pic. It looks like a blue thread such off the bottom of blue jean cutoffs ... except it moves on its own and may stays on the bottom.

I will work on getting a pic.

 

[PsiStar]

I think this is the same thing I saw crawling around on the rocks a while ago. Today this thing was on the wall. It is actually about a little over 1/2" long.

So what do you think?

 

[RockStacker]

It looks like some kind of nudibranch.

 

[Aquarian]

I think it's a juvenile Stomatella snail