Hi! My 1.5 YO red foot tortoise has unusual plastron color (whiteness) and I have noticed her scratching her shell on the walls. I did some research and it appears that I was keeping the substrate too wet, but what should I do now to make the underbelly look normal? Also, are streaks of light coloration on the shell a reason for concern? Is it shell rot? We already took her to the vet a few months ago to get the underbelly checked out, but didn't get any answers. Doesn't seem to be affecting her behavior. Photos attached. Any advice would be appreciated! Thank You!