If they continue to fight i still suggest calling the breeder for an exchange. From my experience a pair should do little actual fighting. If the smaller once does not submit quickly your in for a long road. Sure there is some to show dominance. Chasing around is one thing. Straight out attacking is bad.
My female will still pick on the male, but its not like before when it was jaw locking, fin biting, straight out hunting the other one down to pick on it.
If my female ventures away from the anemone my male is right there with her.