Male flowerhorn won't fertilize eggs

[Yumu]

I have the same problem. Wish they would spawn because she's a kkp and he's a 12 titanium with decent kok

 

[Exotic Aquatics LLC]

He is probably infertile or to small yet. The prime size for a flowerhorn i would say is 6". but if he is over that then he's infertile. it happend to me before however i spent 1500 on that fish. thank god i sold it for 2000.00 good luck