I noticed this weird dark area on my pastel black pastel champ and I'm a bit concerned as the darkness looks comparable to the darkness I see on the top of her head where her eyes are-like there's something dark there. I keep her on cocohusk substrate & spot clean by removing any waste & a few surrounding inches of substrate if I notice anything when I do a daily water check. they get topped up every day & the water dishes get scrubbed every other day, and the whole bins get a scrubdown once a month so I don't think it could be scale rot. any help would be appreciated!
https://imgur.com/gallery/TfbOTBj