I hope someone has suggestions, for my situation.

I have a large cage, which hosts 2 males and 2 females (yes I am certain by their cere colorations); all are 2-years+ old.

The two males now seem to be fighting over one of the females; I have witnessed them in a full-out brawl on the cage floor. Neither seems to pay much attention to the other female.

One of the males is clearly the alpha, and aggressor (and no coincidence, is the largest of the four).

I have another, smaller cage, so I could consider separating the four, but would like to hear from experienced budgie owners the best way to deal with this situation.

Thanks!

I suggest you remove the aggressive male immediately.

After you've removed the aggressive male, we can then address the issue of how to best house your budgies.

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Yes, I made the decision to remove the aggressive male to the smaller cage, with his favored female. Is that the best move, and should it be a permanent change?

Thanks much for your response!

Yes, I'd suggest you keep it as a permanent arrangement.

You'll want to ensure you discourage breeding behavior.
When We Don't Want Eggs! - Talk Budgies Forums

Does the cage you moved the pair into meet at least the minimum size requirements for two budgies?

Minimum size for 2 budgies-----30x18x18"
Volume = 9,720" cubic inches

Minimum size for 3 budgies-----32x18x20"
Volume = 11,520" cubic inches

Minimum size for 4 budgies-----34x18x25"
Volume = 15,300" cubic inches

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Hi there and although I see you've been here for a while, an official welcome to Talk Budgies!

I agree completely with Deborah's advice and with what you've done

I hope the new arrangement works out and I also hope to see pictures of your budgies soon! Feel free to ask about anything else you're concerned about as we'd love to help.
Hope to see you around the forums!

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Quick recap: aggressive M in large 2M-2F cage was relocated to another cage, with favored F ("FF").

FF started chewing on perch (behavior not seen previously). I immediately put her back into larger communal cage.

Question: Any suggestions as to dealing with an aggressive male?