My Kids feed well

Male Reeves Turtles are usually quite melanistic as they age.
They are renowned that their eye became quite prettier with the blackening.
This male seems yet too young to became black-colored.

No sign of melanism yet with comparatively light brown in color for a male.
His plastron looks like having black markings on the yellow.
Usually males have more of very dark shells and skins.
That's why I'm wondering if he's an hybrid with other species.

I wonder if he will become melanistic little by little with age, it's interesting to watch.