After I soaked Dex in her pool, I flipped her over to clean the bottom of her shell with a rag. As I was cleaning in a circular motion, a piece flicked off. I wasn't pressing hard so it didn't take much. I was standing on grass so I didn't see the piece to confirm what it was. It was a dark chunk so it could have been mud or poop lodged in there, or even the piece that was healing. It looks somewhat deep for me to not have post something o here. What would you guys recommend for treatment? Keeping it clean daily? Putting her somewhere away from dirt to keep from infection? I could follow the shell rot treatment if that's what it looks like. Here's the best pictures I could get.