It's possible the fighting was caused by the close proximity of males and
females. Before my pregnant rescue female had her litter, I never would
have believed it, but I had a tank of 3 sisters from the litter next to a
tank of 4 boys from the litter. The sisters, who had always gotten along
fine, began to get really nasty with each other. I wanted to avoid
splitting the 3 up if possible so, on a whim, I moved the boy tank and
replaced it with a tank of females. I have not seen them fight since!
I've had this experience too - I had to move my girls out of the boys' room and since
then (over a year) they've been fine!
Molly
