I have some koi food that has been sitting around forever, and gave some to my call ducks today, and they just went nuts over it! There's nothing harmful about that is there? I looked at the ingredients and there didn't seem to be anything that they wouldn't eat normally (corn meal, wheat meal, soybeans, fish oils, fish meal, etc). Any one know if there's something "bad" about feeding it to your ducks as an occasional snack?