tiny crab in my birds nest

[goobe]

So this morning i found a tiny crab in my birds nest. i guess it found a new home, since it was in my very first SPS coral (bought it for 4$ wanted to see how if i could reverse the bleaching) that i bought that was half bleached and actually died.
now my question is should i leave the crab in there or try to get it out.
im scared that it will kill the BN. the coral itself has been doing great polups fully out.
anyone know anything about these little hitch hikers and if they are good or bad
p.s. its a little red crab maybe half the size of a dime
Thanks

 

[spanko]

Go to the first link here.
http://lmgtfy.com/?q=commensal+acro+crab

 

[goobe]

smooth tanish crab, looks like mine
thanks for the quick reply spanko. ill keep an eye on the crab