Little white crab on SPS!?!?

[BioMan]

I just got 2 mini colonies of sps and within the branches of each I spotted a little white crab, smooth shell, black mask. I searched this website didnt find anything, searched the web and all the posts were like 4 or 5 years old conflicting information.
I found a hairy black one that was positively ID'd as a gorilla last time I bought a colony and sent him to the sump in the sky but,, these 2 seemed to be "Banded crabs"
Should I leave them or assassinate them?

 

[kres1024]

Acro crabs ,good for sps

 

[BioMan]

Thanks, I dont know how these guys make it past my inspection every time!

 

[rookie07]

They are often the same color as the coral they live in...they are literally designed to hide and blend in! Don't feel bad about not seeing them at first!

 

[piranhapat]

https://www.google.com/search?q=acro+crab&ie=UTF-8&oe=UTF-8&hl=en&client=safari

 

[BioMan]

nice, link to liveaquaria,,I got freebies!!

 

[ctcorals]

most of my acro has this Acro crabs on it,they r white corlor n stay the small size never grow,i heard that they r good for acro as clown is good for anemene..