Have you done your research on his breed?

yes.

I dont blame cheeko. Jag was outsidee and he brok through the door and knocked down Cheekos cage.

I also agree with your post PCB,, But I try and try.. nothing works.

My cockatiel hisses at everything, Air, water, the mirror, my, my brothers, my mom, dad, dog, cat, Spanky, his own reflection. He has big issues, i dont know what to do but let him be because palying or tamming him I find maks him more stressed. out.