I have heard of cockatiels becoming aggressive when hormonal which may be part of the problem. In tamer cockatiels it does IMHO help many aggressive tendencies to have wings clipped. We have had several that would be very handleable when clipped and become quite aggressive when their wings regrew. I would suggest at least trying this to see if it helps. I would also suggest keeping a close eye on your female. Some males (although not usually in cockatiels) will kill their mate if they become too aggressive when hormonal. If the aggression seems to be affecting her then they will need separated. Otherwise it could just be when he feels threatened or that his mate is threatened he acts on his aggression to whoever is nearest whether that is his mate or a human. Good luck.

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