Snail/Cuke/ALIEN?

rwynn

Big Daddy
So I notice these two little guys yesterday as the lights were coming on, and again tonight.

The are crawling around on the rocks around coral but not really taking any interest in them..they were on the glass the first morning... My wife has the laptop out of town so I cannot get the images off my camera.

They look sorta like a cuke, about the size of my thumbnail, one is a darker color....I cannot tell exactly but they look like there may be a shell of some sort or just a variation in color...but a definite seperation of head/mouth and the back area....So..what are these? They look a little like my fighting conch...And they can move pretty fast from what I've noticed.
 
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