What age should the Gouldians be when I purchase them?
I always suggest that you purchase juveniles of at least 6 months and take the next 6 months to create for them the best possible diet and environment for a happy healthy life. This includes the ability to raise a healthy clutch of progeny. Even if the birds that you purchase are older than 6 months, I think that it is a mistake to allow them to breed without a proper diet. The stress of breeding will only weaken them and you will most likely loose your hen to eggbinding in the process.