I actually gave up. My 3, who love each other during the day, get very mean at bedtime. I could no take that squealing sound they make when they get afraid from attacks. I just went out and got two more cages so all 3 have their own cage at night. Best thing I ever did for the budgies hands down.
I am lucky mine get along. They have some fighting but they learned to respect one anothers space but its a soap opra during the day. Hantzie likes Oliver but Oliver wants Quieksen and she wants Rainbow and Snowflake wants neither one of the boys lol