crab identification Help

[LE0]

well..... i have a crab hitchhiker, i no nothing on him/her but its purple about 1inch long and has white eyes? can someone identify it please?
there is a pic included!
image
image

 

[LE0]

anyone?
should i be worried?

 

[Dondomingo]

Been googling as I'm not the reef expert, still looking

 

[mangups]

See here and see if you can identify...

http://www.advancedaquarist.com/2010/12/inverts or here:

 

[Atomsk]

Did you find out what kind of crab that is?