Thanks for responding but no one really answered my question. I have had budgies before so only provided the basic details. I don;t think double the nest boxes is really required in colony breeding. They tend to sort it themselves. Maybe some initial arguing sorting out the pecking order but nothing unnatural. Colony breeding is the only option for me. I don't have time or room for pairing up in breeding boxes etc. All my birds are from show breeders so they are all tagged. Ages easy enough to determine. ( didn';t look at them when buying LOL)
Anyhow, they are starting to pair up and some of the hens are going into the nest boxes now. I'm still a few short on hens I think, about 3 of the hens I obtained might be old duds I think. They look old. Anyhow, I will update my profile to reflect the amount of birds i now have.
cheers
E.W