Your female is starting to show breeding colors. That doesn't mean she's going to spawn right away, but don't be too surprised if it happens pretty soon. The yellow and black will intensify until she looks like a bright yellow fish with black striping. Your male looks totally normal to me for cacatuoides. Males don't turn yellow.
Hopefully, if they spawn, they'll leave your other fish alone. They aren't terribly aggressive, but you have kind of a lot going on in the bottom of that tank. Good luck!