Help ID Small Crab Found on SPS Frag

[Nesty427]

I found this little crab on a SPS Frag that was given to me. Its a small white crab with a black line on its face and black spots on the legs about 1/8 of an inch. Is it Good or Bad? Sorry about picture quality, I`m adding a link to a youtube video of it. Thanks

https://www.youtube.com/watch?v=43Fcr26THZM&feature=em-upload_owner

 

[duke62]

Good.

 

[duromega]

put it back where it was,
it's an acro-crab
good to have.

 

[Nesty427]

Thanks duke62 and duromega. I just put him back in his home

 

[duromega]

Tiny crab protects coral