My nandus ate dead food. I "trained" him to.
Put a small piece of shrimp on a fishingline Move it around the tank, and he might be intressted. (It will look like a feeder in his eyes) lol.
But make sure the shrimp come loose easy so you dont hurt the fish =(.
i had a nandus nandus, couldn't get him to take anything besides earthworms and feeders. I starved him for a week trying once again to get him to take dead foods, but then my salvini didn't like him and beat him up, and he was week from not eating so he passed away before i could get some gutloaded feeders pumped into him.