Newbie breeder in need of help

[Foxers]

Hi there ^^' im a bit new to breeding bettas but ive done a lot of research.
Now i have a breeding tank set up, the water was clean and cycled. perfect pH, and both male and female where healthy.

So i put my male crowntail in, he made a great nest and i released the female today.
She was swimming head down and all, but then, while he was coaxing her in, he killed the nest! i mean, he is still rebuilding it, but when ever he tries to get her closer, the same thing happens!
So i turned their light off, because i thought maybe it was too bright, and i fed them.

Am i doing something wrong? Please help

Iryna N. <3