Okay, so I've had this cherry head tortoise for almost two years now. He eats really good, although it's picky. Anyway today I picked him/her up and looked at the bottom of its shell and noticed this. I don't know what this is and what to do about it, but it doesn't look good to me. Can someone enlighten me? I'm really concerned about my little guy. And this seems like something that would take a bit of time to happen... so I feel even worse.