Earlier I had asked the question about Apistos Cockatoos and adding males to my tank. Here is the update:
The seller on Ebay sent me 5 . I didn't order 5, but that's what he sent. I offered to pay for the extras and he said, "nope, all good". So, I currently have 4 Bolivian Rams, and 5 male Triple Red Apistos Cockatoos in my 36 planted tank. I did ask the seller on Ebay to send me juvies so they are smaller, but still colorful.
Other than the Rams charging at each other once and awhile like they have always done, all is well. There have been zero problems and as far as I can tell, no lines are being drawn for territory. Everyone just swims together. The rowdy ones in the tank are still the YoYos.
I'll let you know if this changes