I think that as you have to be away from your bird’s, your best option, at least for the time away, would be:
Apple in a cage alone
Kiwi in a cage alone
Ollie & Mozie in together
I personally wouldn’t leave Kiwi in with Ollie & Mozie whilst you’re away. You said that both Apple & Ollie were competing for Mozie’s attention, if Kiwi’s attack was the result of him also making advances with Mozie, then Ollie & Kiwi could become aggressive to each other.
You’re still trying to piece together the sequence of events, even though Kiwi ended up worst off, he might have ‘started it’ so to speak.
You can keep the cages in the same room, so they can still have sight and sound of each other, but safely split apart. When you return, you can reassess the situation.
Best of luck
*Actually, rethinking things, maybe it would be better to leave Ollie and Kiwi together and have Mozie in a separate cage - less extra trauma for Kiwi and it IS Mozie who is (inadvertently) the source of all the competitive drama.
Last edited by JRS; 11-21-2017 at 04:22 PM.