I’m not sure what’s going on with my cockatiel and his feathers
So my cockatiel has been losing feathers since the Fourth of July. Since then, everyday I find a lot of feathers accumulating at the bottom. I started giving him The Missing Link Avian Formula two days ago and I’ve been bringing him outside for morning sun. I also try to mist him twice a day even though sometimes he doesn’t do anything other than fluff up and shake the water off. He’s also been doing a lot of preening lately. I catch him preening a few times throughout the day and at times find the broken keratin sheath at the bottom. Should I be concerned? What should I do?