Congo tetras will definitely eat young shrimp that are small enough from what i've heard... since an LFS was admiment i dont put any type of fish in with mine, and they tend to sell a lot of tetras from different regions...
-edit-
I should probably have also added that by now, im sure you know most fish will eat any type of shrimp (especially their babies) if they are small enough...
With that being said though, i've always been advised if i wanted to do fish with shrimp to build a really strong colony of shrimp before adding any fish...