I have a breeding pair of Firemouths in a 55 Gallon tank with a Blue Crayfish. I read that once they becomea pair they are always a pair but they fight just like they are married. Is this unusual behavior. The male attacks the female but sometimes she stands her ground and he changes his mind but sometimes he just goes at her so quickly she doesnt have time to react. She doesnt seem to be getting dmaged by it but I dont want her to be stressed out. Any ideas? TIA. 