Introducing a knew cockatiel

Question
I ahve had my cockatiel for just under 4 years and he has always been extrememly tame; being very affectionate towards me , cuddling up to my face and letting me preen his face. However, i recently got a new cockatiel to keep him company whilst i am at school. he has now bcome extremely visciouse towards me when around it. H eis fine when he is not with it, but when they are out together he will follow it around and attack me whne i go to stroke it. The new cockatiel is just over 2months old, we are not sure whether it is male or female. Could be trying to protect it beacuse its so young?
Will this be an on-going problem, should i consider re-homing the new cockatiel?  

Answer
Hello and thank you for your question, I would rehome the new one, You can Not have two friendly handfed cuddley birds it just doenst happen. if they are differnet breeds of birds in differnt cages then there is a good chance of haivng more then one friendly bird. I have done this so many times before with a frueinedly bird and getting another to keep it compny then the older bird just isnt the same. It will continue into the following years its unavoldible unless of course maybe you house them seprately and letthem out seprately?