How can you tell the difference between a male&a female black molley

Question

How can you tell the difference between a male&a female black molley

Answer 1

Males have anal fins long and pointed

Females are rounded and fan shaped.

Answer 2

The male has a distinct pointed anal fin called gonopodium. The female's gravid spot is not that obvious so the only way to tell is if it has a rounded fan-like anal fin.