It’s quite easy to tell a male Platy from a female by examining their anal fins (the rear fin protruding from their bellies). If the anal fin is fanshaped, your fish is a female. If it’s long, flat, and pointed, your fish is a male. Females are also usually bigger than the males, though this is not a hard and fast rule.
Platies in the wild survive on algae and insects, which provide them with plenty of fiber. Be sure your Platies get plenty of fiber in their new aquarium home. Platies need to eat once or twice a day and they are usually eager to eat, but don’t overfeed them. If they don’t eat all the food in a few minutes, you’re giving them too much at once. You can use a flake food diet, but supplement it with live or frozen food which offers more nourishment. Try live or frozen brine shrimp as well as bloodworms. It’s also a good idea to select flake foods that include vegetable supplements.