he was sold to the pet store with his mate. The original owner didnt tame nor bond with the birds im guessing. The pet store then sold his mate. 2 months later, I visit the store and buy him, thinking cockatiels are sweet and love companionship. After a couple of months after he got comfortable with me now all he does is scream. I sit next to his cage sometimes til the screamign drives me nuts. He does this tail fan thing when i get too close to his cage and hisses at me, unless i have millet and hes hungry. If hes not hungry he will hate me and scream. His cage is 30x22x45 inches, I think its big enough for two cockatiels. He has so many toys, he only plays with a couple of them for a short while then screams. Bells, balls, foraging toys, paper, leather toys, a cactus wood perch I put seeds into (which he wont let me unless hes outside of the cage or he will try to bite me). I allow him to come out on his own. He doesnt come out often. I've also been trying to get him to eat healthy, and it took me 5 months to get him to eat sprouted millet and flaxseed. I had to mix it with seeds to trick him to eat it, over the course of 5 months til he finally does eat it. He wont eat any other sprouted seeds either. In fact, he stopped eating most sunflower seeds and safflower seeds and now just picks out millet. An odd time he crunches on his pellets,(maybe a couple of times a week) but I think its just because he wants to chew on something, like how he chews his cuttlebone. He has no interest in veges. Ive tried mashing, mixing, hanging, the works. He hates vegetables and fruits.