no problem for me
used to have 1 coral banded shrimp and 1 blue-legged hermit and one cheapo beach hermit
then let go the bigger coral banded and now have tiny purple coral banded shrimp
so far no issue
coral banded shrimp can run and swim much faster than the hermit ... hermit cannot swim
but I suspect blue-legged hermit may kill asrea or turbo snails