Well again my first guess would be hormones and there really isn't any treatment for that just patience and understanding. I would suggest a vet visit though depending on how long it has been since the last one. Sometimes aggressiveness, excitability and mood changes are signs of sickness or other problems that may require a vet visit.

One other question though. Before the new arrival were you making any changes? Possibly moving cages, furniture etc to make room for the new arrival? Or did it start even before the new arrival was though of? Sometimes even without actual changes a bird can seem to pick up on our anxieties or stresses when we are thinking about making a change, even before the changes actually happen. Of course if it was before you ever even heard of the new bird then this wouldn't be the case

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