I have kept some on a few different occasions, but do not keep any currently. My fist one did well in a tank with 1 bluegill, 1 rockbass, and 8 spotfin shiners. It did well until it reach the 4-5'' mark, was clearly sexually mature (bright colors, fanning out the gravel, too), and then killed off the bluegill and rockbass. It ddi fine with the spotfin shiners since they were about 4 inches as well. When he reached 6 inches, all but the biggest two shiners disappeared. My second experience was a bit different. I had 4 redbreasts and 6 greens all around 2'' in the same tank for about a year until they became too big, and I was moving to another state. So in my experience, they either do best when by themselves accompanied by large, fast minnows (too big to eat), or in crowded groups where no one can establish a territory. All in all, redbreasts are some mean SOBs. I love 'em.A female huh? That's pretty cool! You ever kept these guys?