[Takoda]

All of my cockatiels eat at least 50% pellets. They go back and forth between Kaytee and Zupreem, depending upon which I can get ahold of at the time. I find most people just give up on their birds eating pellets pretty easily and cave in to the bird. What I use whenever I have this problem is the month long conversion process. If you have an older bird, it will take more time. Every bird is different.

Week 1: 25% pellet, 75% seeds
Week 2: 50/50
Week 3: 75% pellet, 25% seeds
Week 4: Mostly pellet with seed treats (which is what you're aiming for)

You can also try removing the seed for a few hours with nothing but pellets available. You can also try birdie bread, and mix in pellets instead of seeds. The key is perserverance! Cockatiels are extremely curious by nature, they will eventually try the pellets.

My cockatiels love veggies; they aren't too fond of fruits, but generally like dehydrated fruits. The veggies my cockatiels especially love are broccoli, kale, zucchini, peas... they don't tend to like carrots, although with a few of them it's just how I cut them. Some like sticks, others like chunks, some just don't care for carrots. A well balanced diet for your cockatiel should consist of pellets, veggies, fruits, grains and pastas, and a bit of seed. If you can find an awesome seed mix (meaning it has a couple dozen different kinds of seed) then I'd probably give a little more. Most of the pet store seed mixes are extremely limited in the variety they offer. Don't think that allowing your bird free flight time makes up for eating a mostly seed diet - you're never going to be able to recreate the amount of flight they get in the wild. And you will find it very difficult to offer the variety of foods they eat in the wild too, particularly, as stated, the seeds.

Treatwise, my birds enjoy Cheerios, nutri puffs (good for the tubby birds too!), spaghetti....

If you are going to keep late hours then, as suggested above, you need to cover the bird so it can sleep.