I hope he gets better. good that he seems a bit better. If you have another cage or can borrow one, it probably would be a good idea to separate them so the other bird doesn't get sick too. As he's feeling better, maybe try pellets, corn, peas (even canned is OK, try to get low or no salt added), potatoe, rice and millet, as well as the seeds. also I heard they like whole wheat bread soaked in milk, but you can't leave it sit too long or it would spoil, or I guess you could make it a bit mushy with water too. that way he also would ingest the water too. If not drinking he may get dehydrated. It's good if he eats the apple, also oranges, grapes, they have liquid too and will help him. mine like canned mandarin oranges. good luck