I just bought two baby Kigoma Frontosa today and one is the regular blue with dark black stripes, but the other has a lot lighter stripes - and it has a lot lighter body overall - does that mean that it is a female??
When they are small like that color usually is just a indicator of whether dominant or not or also whether the fish is comfortable or nervous. You might be able to vent them to tell males from females when they are 5 - 6 inches in length. Nice looking little fronts though !