Help?
The main question is.. do you think this white spot is shell rot?
Back story: we got him as a hatchling and his shell had a minor deformity (you can see in the pictures, behind the white spot) he was growing well, eating well, thriving. (We have 3 others from the same hatch and they’re all doing amazing) As this one grew, we sometimes find him flipped upside down.. we figured the minor deformity might be causing some issues, but always wondered if there was more underlying. We just noticed this white spot on top, that wraps to underneath (second photo) I included pictures of the top and bottom of his shell just for reference.
We’ve already quarantined him and started the process of trying to fix it, if it is shell rot, but just looking for outside opinions