I have two male budgies who are around 4-6 months old, we've just bought them a huge cage (118cm x 59cm x 135cm), and are thinking of getting a cockatiel as well, in the hopes they can all live together in the big cage down the line (but we're obviously prepared for them to not get along and have to live seperately). I wanted to know how easy it is to introduce them and how long this process takes. Would our boys have a better chance of getting on with a male cockatiel or would they get territorial? And is there anything else I need to know before making a decision?