Swordtails (Xiphophorus helleri) are larger livebearers in the same genus as Platies. Reaching about 3-5" in length, they require more space than many livebearers, but make up for it with high activity levels and the gorgeous "swords" that males possess on the tailfin. Like other livebearers, we recommend at least 2-3 females per male, so the males don't wear them out with constant breeding attempts. This is the Red Wag variety (orange/red with black finnage).