hitch hiker id cuke nudi?

[n8ball2013]

hey everyone was watching my tank and saw what looked like a nudi on the live rock. It was all black and had a white spot in the middle. size was roughly a quarter and the white spot made it look like an eye almost. it appeared to be slick without any spiny looking things so i dont think it was a cuke. It didnt look like any nudi ive ever seen. Any one have any idea. I couldnt get a pic of it due to it being in a dark spot in the tank.

 

[sly]

Maybe it was a black sea slug? This one is called a Black Dendrodoris Sea Slug.

 

[n8ball2013]

nope not quite i spent a long time on google image search trying to find it. it has on e big white spot and thats it. very weird to me if i see it again ill get a pic.