I've had platies but they don't like as warm a temp as bettas, so mine have all died off. Our's have all died off. Mollies, however, have done better. Shame because ime, platies are calmer and less "frantic" in their behavior and therefore more interesting to watch. Right now we have one more platy and 3 mollies. D'Argo flared at the two newbies a little at first, but not too much. Now, he still will run them off of his lawn so to speak (his corner of the tank) but he doesn't stalk them, attack them, etc. He'll eat beside them happily.
My bettas: D'Argo + the girls Jullanar, Lalla, Razz, Rayleigh, Aviendha, Arya, & Lovelylocks
plus the other guys Toni, Eli, and Clinton (platy, guppy, and molly) a kuhli- Burt, 2 yoyos- Duncan and Ma, and otos, Laurel, Hardy, Larry, Curly, and Moe, plus the kitty, Clara the Impossible Girl.
SIP: Turk (teal VT), Azul (royal blue VT), Jerrica Benton (pink cambo CT), Lady Amalthea (blue cambo CT), and Jadzia Dax (blue VT)