I keep Japanese Quail for Eggs, They do occasionally fight, but when they do, the go for the kill! Luckily I have always found them before it's to late, I have 8 Hens and a cock, The hens one day layed 13 eggs between them, They are prolific layers, I'll give them that! we pickle the eggs with sliced onion and garlic because they lay so many.
Mine are two years old next month, and they still lay a egg a day most days. Good Luck with your adventure with quail!