Thanks everyone for your advice, I'm going to try some of the above. I actually saw him eating!! I think his beak was so overgrown, he wasn't eating much of anything. I couldn't believe how overgrown it was, I feel bad I missed it, but it happened so quickly. The vet "re sculptured it", so he's handsome now,at least with his beak. Now we have to fix his feathers. I've had my kaks for over a year, on the same diet, and his colors has been gradually getting dull over the last 6 months. I would think it's from the seed, except Luigi, his cage mate looks very healthy. His feathers are brighter then when I first got him. And when I got him, he had no tail feathers ( the previous owner said he chewed them off), it's taken over a year, but he now has tail feathers!! It's difficult to compare colors of the two because Bam Bam is a normal green and Luigi is cinnamon green, so 2 completely different green colors. I would like it's diet if both kaks have bad feathers, but only Bam Bam does, so maybe it's diet in the sense of Bam Bam not eating and Luigi is eating everything in sight. I am going to canadian tire tomorrow to buy a scale. I have to buy a gram scale, since he's only 66 grams. I'm going to watch him closely, offer more veggies and pellets. I can't take away the seed completely, I have a feeling he just won't eat and starve. I just have problems what seed to buy, I have been given them cockateil seed- goldenfeast. and also seed for small parrots. They have several options.
I have to give him his vitamins once a day, I was told I could put it on his food, but I don't know if he'll eat it. He won't eat if I'm in the room ( he's very shy) He'll take it in the syringe if I can catch him, but that means I have to catch him ( he won't step up), and that traumatizes him. Raspberries are him favourite, I might put it on one, and try handfeeding him it, maybe he'll take it then.
The vet also mentioned he kept blinking his eyes frequently as well. I didn't know this was a problem. There's a lot about birds I don't know. She thought it might be stress, and just to keep an eye on him. Hopefully it's just vitamin deficiency and he'll improve.