HI, i have 2 sisters, about 3mths old now. when they were at my fren's hse temporarily at the beginning, they were fine with each other, other the 2nd day tat they came to my hse, they fought, or rather 1 was bullying the other and i found tufts of hair with the bullied sitting at a corner most of the time. i separated them for about a week where they could see and sniff each other. just yesterday i let them out i the playpen and i put them back into the cage with the divider removed. the bully has been chasing the other one around every 2-3hrs. y is that so? can i not separate them? nid help!