
(and don't worry - this photo is from several months ago - I know better than to chase them around with a camera now that they are attempting to breed!)
My pair has one of these large cages to themselves. So I don't think crowding is causing the above aggression. And the birds in the cages next to them are doves and Green Singing Finches, which they show no aggression towards.

To help them out with raising babies, I have provided them with fresh sprouted seed, millet spray, live meal worms, dried insect and egg mixes, and fresh egg food (made from hard-boiled eggs + Miracle Meal) - in addition to their regular finch seed / pellet mix and grit. Did I forget anything they need?
From reading other posts, I see that Gouldians may take a while to "get it right" and lay fertile eggs and successfully raise their own babies. So I am being patient....