okay so my two new members koala and ninja are both sisters. Every time I feed them ninja always chases koala around and pins her down and nips her and koala screams bloody murder. They continue after i tap the cage or open the cage to separate them. Is this normal? they are fine otherwise it is only when i am feeding them. also when i have all three girls out Pandora my older female about 1 1/2 and the other two girls they are fine and then panda will chases one of then and pins them down and it looks like she is going to bite them this is very loud and disturbing for me i always immediately separate them before Pandora can nip. Is there anything I can do? I have them on a neutral ground with no food. please help as i would like to have everyone get along.