Platies, including the red wagtail, come from Central and South America, in the region from Vera (Mexico) to Belize. Platies prefer small, warm bodies of water with silty bottoms and vegetation, such as ditches, canals, springs, and marshes.
Platys have a reputation for being amiable fish that get along with each other. Only when you introduce two males to a tank would you normally see any sort of aggression.
Both Platy and Molly fish belong to the same family of livebearers. However, platies tend to have bodies that are shorter and rounder in structure as compared to mollies that are longer and a tad bit sleeker in appearance.