What in the name of Samuel L. Jackson is this?

[TarheelFrag]

Before leaving this morning I was checking out my tank and discovered...


This!

It is about 1/8" long and was slowly easing across the rock. It looks like some kind of a cuke but I am not sure.
Can someone please ID this for me?

 

[LeslieH]

Next time you see it use a turkey baster or a brush to take it out, then photograph it in a dish. From the image it could be a nudibranch, a flatworm, or ???? Just not enough detail or color to be sure.

 

[TarheelFrag]

If I had to give more detail I would have to put it under a microscope.

 

[wan 2 B reef'in]

... from what I see in your pic I would say it looks like a nudibranch, but I'm no expert .