
Eating poo in t his case may be that they are still hungry and that the poo contains undigested food.
What happens if you give them more food (im guessing that they may poo more).
Either, the amount you are giving is too small, OR, and i think this is more likely.... part of the content of the food is not being digested, thus they may eat a fair bit but digest very little, and still be hungry.
In which case, a different food may be the answer.
Em