Can you ID this little guy?

[mmakay]

This is a hitchhiker I found on some coral recently. It's about 1 inch long. Kind of reminds me of a juvenile cucumber, but I really have no idea.

http://farm6.staticflickr.com/5517/12019183404_ba4075ef66.jpg (http://flic.kr/p/jj6su5)

So, do you think he's reef safe? Evil? Beneficial?

[GerritM]

Sea cucumber --> Afrocucumis african (?)

[mmakay]

The body shape is right, but everything says the Afrocucumis is purple. Not sure this is close enough to count as a color variation.