It could go either way! There's no telling sometimes there's no bullying and sometimes the older female will be alittle mean to the new girls and the males to the males or even females. The current pair I have now we're introduced at different times. My female was about 3 months old and the male...
I would wait until they are matured and ready to mate. The females may not take well to the matured males if they aren't old enough and the same with the males and the adult females. They may get picked on. I've heard 1 male to 3 to 5 females is preferable. I have 1 to 1 ratio currently because...