My female rats are fighting more than usual...what's going on?

That happend to me i had 2 female rats and the were all fine and loved eachother, but then they started fighting alot i think it is becasue the cage was to small for both and they were feeling they need more space for just there slefs and sharing the water and the food got them all cranky so maybe get a bigger cage or get another one and see if there better by there slefs.