I have a large cage with two beautiful baby budgies in it, Gracie and Capt. Jack. Should I leave well enough alone or can I add more budgies? If I add more is it best to go in pairs? I have become quit attached to my babies but my grandaughter asked if she could "call" one of them her's since her mom won't let her have one. This would be easy enough since they won't be leaving my house but I thought if I let her go pick one or two out, it would make it more personal to her and I get to keep Gracie! The cage is 18" x 30" x 36"