Nutritional value of foods is more important for pet birds. The nutritional value of foods contains various types of vitamins and minerals. It is advisable to serve the raw foods like seeds, fruits and vegetables in raw to get the natural taste of the nutrition’s. The African Congo is like to eat seeds. I think you must have to serve the raw food which contains different types of vitamins and minerals.
You need to select the proper raw food which contains good nutrition value as suggested by expert or vet. I think, you must have to serve the natural foods as suggested by the vet.