how can i introduce a new lovebird to my other lovebirds?

[KIO]

I have a couple of lovebirds I bought to breed. They are now abt one year old. I later discovered they might be both females so I bought a male that is nine months old (this is what the seller told me he was) but my two other birds seem to not like him. they keep trying to bite him. i have a blue (Akane), a yellow (Ryoga), and my new one is green (Ranma). they are peach faces. honestly the blue and the yellow act like a couple since they regurgitate to each other and i put a nest box for them and a palm tree leaf. they shred the palm tree leaf as if to make the nest but they just drop it on the ground. a few of the strips they shred are put in the cage barely none. they go on the large nest box and come out but thats it. neither bird has mounted the other and the nest hasnt been made. however they are always together right next to each other wherever they go. anyways, am trying to get them used to my new green lovebird Ranma. i have Ranma in a mini cage next to the other big cage where Ryoga (yellow) and Akane (blue) are at. Akane seems to be curious abt Ranma. Ryoga justs wants to bite him and hurt him. but when i take them three out they both try to attack Ranma. i will try to put Akane and Ranma out and Akane is just mellow but later tries to hurt Ranma. Ranma is really calm most of the time and he just runs away.. if i put Yyoga and Ranma, Ryoga runs to hurt Ranma. idk what to do. pls help me figure out a way for them to get along? i been trying to have them cope with each other for about four days. i know it might take longer than that but i would like some tips if possible.

 

[Kyle E.]

They'll fight to the death. NO!!!