Not So Nice Bolivian

[Captain Retardo]

Hello, I recently, 2 days ago, got 2 Bolivian Rams but there is a problem, one of my Bolivians is chasing the other around. it is the female one, I am pretty sure of their genders. She bits his head and fins and I am worried about my male...

What is the problem?

 

[Captain Retardo]

Update-The female still chases the male, but only during day time, when the tank lights go out, they are nice and even swim together.