sorry, but based on My experience, I must suggest no fish for shrimp aquarium, We can not only think about is this fish will eat the shrimps ?
but I suggest We must think about other too, like will the shrimp not disturbing by fish waste/ammonia, fish activity, the fish maybe vegetarian but the shrimps maybe can not understand that, they will have fear and no joy in aquarium for the shrimps, but have some fish can be important, sometime We can send few fish to shrimps aquariums if the aquariums have too many other little bugs which disturb the shrimps colony, after the task finished, We must take the fish back to their own dedicated aquarium, I think it's more naturally :)