You probably won’t have a problem unless you seek to breed them and put in the effort to separate them. I have a 55 with swordtails and mollies and over the last two years I’ve only had a handful reach adulthood. The tank is pretty well established now with lots of plants and nooks and crannies to hide in and I have made a conscience effort to separate the fry when I find them. I’m only now growing the population. Your experience may differ, but I have found them to be pretty self regulating.