I agree with those who say the fish is too young/small to show any sexual dimorphism. If you have more than one of the same age, the males outsize the females by a wide margin. But both sexes are very similar. Here are a few pics of some of mine.
two females 7-8"
Young 5-6"
Mature pair Male 10" female 7"
young pair male 6" female 4-5"
two females 7-8"
Young 5-6"
Mature pair Male 10" female 7"
young pair male 6" female 4-5"
