u/HolyDiverTR

Hello everyone,
I bought two cacatuoides yesterday and I was told they are a male and a female. I put them in an 80-litre aquarium and everything was fine at first. However, today after feeding them brine shrimp, one of them started harassing the other and chasing it around the tank. The weaker one still eats normally, but it now mostly stays near the glass. The more dominant fish seems fine. What could this behavior mean, and what do you think their genders are?