[Blue Ridge Reef]

As inexpensive as it is to feed fish, I tend to only use the best and freshest available -but not a doubt in my mind expired fish food would be eagerly consumed without issue. It's usually preserved with ethoxyquin and if unopened should be shelf stable for years. If it's been opened and fed, it's up to you. Probably perfectly safe, but again, even expensive fish food is really really cheap comparatively.