Yeah he worked in that sorority and then about a year later when he was with the original group and other females I had added over time, I found him practically dead with all his fins torn off. It was completely out of the blue, which is why I never ever recommend people keep 'oops' males in with their sororities.
It all comes down to your set-up and the personality of your females as to whether or not a slightly older female is going to get along with juveniles. Most younger females are not as aggressive or territorial as older females, so it is a lot easier to make the transition into sorority life.
That was Mrs Derp. She had no idea about proper fish manners and so used to invade everyone's personal bubble leading to her getting chased around a lot.