I would agree that the cage needs to be bigger! I would say 18x18x20ish would be a good cage size. Although budgies are small they are active and require a lot of space for play and exercise. Also 1 month isn't really enough time to tame a parrot if your starting from scratch, unless by tame you mean settled in, and it's not something that should be rushed. It took about four or five months to get my parrot more or less tame (stepping up and down, handling wings, laying on back, targeting, going in and out of cage when asked, ect.) so tameing can take quit along time.
I don't know how difficult it is to train two untame parrots at once if you really have your heart set on two budgies, so maybe somebody else here can advise you on that topic.
Good luck with the new parrot, or parrots
