Breeding?

[ellbell]

If I have a some cockatiels and Indian ring necks in an avairy will they try to breed? (I know they can’t breed I’m just curious) and will they fight?

 

[Zara]

Unless the aviary is gianormous, I am not sure keeping ´tiels and IRNs together is the best idea. IRNs are known to be territorial, and not quite as friendly as the happy go lucky ´tiels.
I would be more worried about fighting and birds getting injured or killed rather than breeding.