actually getting him a roomie will be nice for him.. now knowing what you described, but that wonīt make him more "tame".. as he will bond to his roomie other than you, but it will stop the screaming when you leave him alone... and heīll have someone to play, preen, etc....

it can well be another male tiel... and they should do quite well... maybe soem boy on boy action.. LOL.. but nothing to be concerned about...