I am a new owner. I have had my beardie for 3 months and in the beginning he was rather aggressive, but now that he is being fed adequately he has calmed down, but about a week ago I noticed the end of his tail was black/darker. He is eating with possibly a slightly lower appetite and today his beard was black for seemingly no reason. No vets around me can see him for a couple of weeks so I was wondering if anyone had any ideas what is wrong?