You don't have to peel the shrimp. You only have to do that with Muraena, Gymnothorax, and Enchelycore and a few others with long teeth. Gymnomuraena and Echidna eat crustaceans as their primary diet in the wild and have charply recurved nearly flat teeth as well as some teeth that resemble molars. I feed my Echidna rhodochilus live shrimp. That doesn't mean they won't eat fish, it just means they can handle the shell. When that E. nebulosa gets bigger, he'll eat your damsel too. I also hand feed my eels (not with my hand, with tongs, but you get the idea).
I'm new to this particular website, but I know quite a bit about the entire family Muraenidae. I'm actually a FishBase collaborator for the family.
I hate to see a family torn apart by such a small thing as a pack of wild dogs.