Arrow crab compatible with cleaner shrimp?
 

Or will he eat him? My arrow crab is fairly large - aprox 6" dia when spead out.

Geez, I don't know. Arrow crabs can be pretty aggressive. Have had fish eaten by them in the past. Took the crab back to the lfs after that.

I think there is a really good chance that the Arrow crab would make a meal out of the shrimp unless the crab is much smaller,but then it's just a matter of time.

Part of me agrees with both of you, but after watching my arrow try to eat a small defensive blue legged hermit, (I guess this should be a give away..) his 'lack' of coordination and slow clumsy movements Ive seen when I feed him from my tongs makes me question his ability to catch a faster species.

Then again I guess I should'nt under estimate him... better safe than sorry

I've had an arrow crab and a cleaner shrimp at the same time. They didn't seem to bother each other at all.