Substrate staining or something else?

[Tori001100]

Hello everyone!
I’ve had this little one for about a week now and I noticed his head is a bit darker and wanted to ask if you thought he looked healthy and happy!
For reference I have them under a reprising 10.0 UVV T5 HO light and sometimes go out in the sun in a pretty big enclosure that offers sun and shade. (I live in central Florida)
Enclosure is kept at 80 on the cool side and around 95ish on the warm side.
Substrate is reptibark on top of a few inches of coco choir underneath

 

[Tori001100]

I should include I do daily 30 minute soaks in tap water treated with reptisafe

 

[Alex and the Redfoot]

What are distances between UVB tube and basking lamp to substrate? Sometimes too harsh light can cause darkening of scales.