Since the Conure is on seeds already, he will probably do better with Nutri-Berries, Avi-Cakes and/or Pellet-Berries. These diets are formulated with complete nutrition, the same as our pellets, only they contain whole ingredients and provide foraging exercise. In the wild, a parrot spends most of its time foraging for food. We have found this is also important in captivity for their mental and physical well being. Any of our diets can be fed alone or in combination and you can offer pellets along with any of the diets I mentioned above. Most birds get bored with pellets alone, so we do encourage trying them on our other diets for some variety.
A Conure would eat any size between the Cockatiel size and Parrot size. We also make a specific Conure size in some products. For pellets, he would eat the same as the Amazon or possibly the next size down. It has more to do with preference.
The way he is pooping may be of some concern. He should probably be seen by an Avian Vet as he might have some type of intestinal infection. Sometimes they can have a chronic type infection. Another possibility is that some birds will not poop in their cage – it is an instinctive behavior to keep the nesting or roosting area clean. It is more common if the cage is a bit too small. They will hold it for a long time, so when they do poop, it is a lot and they hang on the side of the cage in order to project it.
He definitely needs to get off of the sunflower mix and he is most likely malnourished. But again, a Vet visit would be a good plan to begin with.
Thank you for asking Lafeber,