My turtle's got white round spots just where the new scutes are showing through. His light broke a few days ago so he'd only had sun streaming through the window until I could replace it - I wonder if this lack of usual light caused it. I also gave him flakes for a few days instead of the usual pellets. If it is just air or algae (doesn't look like it) what do I do? Could it be a fungus instead? What can I do to treat in that case?

