Crabs and Coral

Hi all - I recently purchased a lovely piece of Fiji Acropora and this morning found two very tiny little crabs nusselled into the base of it. The LFS I buy all my fish and coral from dips and treats every piece of coral they have shipped in so I have had no issue with parasites before.

I have read that certain types of tiny crabs can have symbiotic relationships with SPS corals so I was curious if I should be concerned about these little guys. I couldn't get a picture but they appear to be tan bodies with white claws.

Thanks to anyone who has information or experienced this.