Colony versus cage?

Why isolate a bird which breeds in small colonies in the wild?  

Why isolate birds which nest happily within a foot of each other? 
Cock chasing cock is part of the build-up to mating.

No harassed cock has ever suffered injury, water or food deprivation - in my experience.

Why miss out on this undoubted colony 'hormone' effect?

A cock is dominant until laying commences.  Then he settles down completely and another takes over the dominant, singing, chasing role.

When one starts breeding you can almost guarantee that all your pairs will have eggs or chicks within weeks

Screening

Not too much can be stressed about the necessity for these birds to feel secure.  Imagine you are the predator

They must be able to retreat away from your gaze but keep an eye on you

On entering your aviary most times you won't even see a Pin-tailed -
they will have retreated

If you can see one once you have entered your aviary either your set up is wrong or the exposed bird is ill

Conifer screening plus green plastic wind-break mesh
available from most garden centres will suffice

A look at the photograph of 'The egg factory'
shows the screening better than any description
 
The  photograph and diagrams  will also show that the birds can retreat to a separate quarter during the weekly clean - again adding to their security

So - how to tell whether any are ill?
Simply place a bar/ perch that is too close to the wall (< 1cm)
but immediately under a lamp

Being too close to the wall it will hardly ever be used by a fit Pin-tailed
One sitting there fluffed up seeking heat is a sure sign of illness

I have never lost an adult without considerable warning of its being unwell

Staging

Pin-tailed Nonpariels rarely go to the ground

The staging or benching upon which the food, grit etc. is available might be important to their feeling of security

How to Feed the adult Pin-tailed Parrot Finch is shown on the