This morning when my daughter checked her gecko we discovered him to be turning black. I also noticed something in the cage that looked like it had been passed by the gecko (seemed to have undigested food) and it was quite large and did not look like anything that the gecko had passed before. This evening his color is returning to normal except for his toes. They still are gray-blackish. Does anyone know what causes this and should I find professional care? Any help is appreciated. Thanks.

