May I ask how big your cage is? A single budgie should live in a cage of at least 14x14x14". For ever additional bird, I generally add 3-4", so a pair should live in an 18x18x18", and three should live in a 22x22x22", and four should live in about a 2 ft cubed cage, more or less. This is all assuming your birds do not leave their cage (which many don't). If your birds do leave their cage every day, then you can hack off a few inches, but 2ft cubed is generally what you're looking at. I'm madly in love with budgies, so you know where my preferance is