I am pretty sure its a male. It has a pointed tube that is sticking out pretty clear, starting to grow a hump, shows no black on the dorsal, and when hes not following the female around he is shaking his head and then digs in the gravel. I know I have a female parrot because I watched her lay eggs and she she has bred with 2 of my male parrots. I will try and get a shot of the tube.
I couldn't get a picture cause the batteries died as I was focusing the camera. I did check the female and her tube was more rounded than the flowerhorn.
Oh and he killed my male trimac a couple weeks ago.
Heres a pic of him a week ago with his tube showing a week ago.