two females

Gill has two new girlfriends, they're a little bit smaller than him. How do I go about putting them all in the same tank? He's a curious little man but not aggressive, should I wait a little? And can someone tell me about the process of breeding?

The lady at petsmart told me that the males are the only ones who fight, but last night while I was asleep Cleopatra ate part of Foxy's tail. I put a divider in between them, but I was wondering if this was common between females or if they'll ever be able to be together again? I'm a first-time...