sounds like you have a teritorial female. separate or be prepared for a tailess collection.
this will not hinder breeding, though the tailess male will probably never mate with the female who took the tail. my experience, not book info here, take with grain of salt. i have had good luck swapping males from two fighting trios. my best breeders though are those who have not been very agressive, both male and females still have tails. this trio produces 2x more eggs than my fiesty sets. i've sold most of my "high energy" cresteds off. i'm done on breeding for awhile, raising babies. the only breeders i have left are a group of super dalmations (mom and dad are white with black spots during the day, dad fires up orange, mom fires up yellow).
good luck with your groups!