My daughter brought home an African Spurred Tortoise about 3 weeks ago. It has the light and heat lamp, gets a water soak couple of times a week and eats 2x's daily. Here's my problem, currently I'm having to care for it, this evening around its mouth has started changing color, a light black color is the best I can describe it. I've searched everywhere and found you all. So far I've found no explanation. Can anyone help? Your assistance greatly appreciated.