So I got a bearded dragon and the whole set-up for my daughter in November. He was very aggressive, would hiss every time a hand was in the tank and caught my daughters finger a couple times. He was eating crickets and veggies regularly, but for the past couple weeks he looks like he’s deteriorating and now has black marks around his mouth and eyes. I’m not sure if I can or how to fix this. I was planning on getting him in a larger tank (from 10 gl to 40 gl) but want to make sure we aren’t going to lose him before doing so. Please let me know if/how I can fix this. I would add a picture but don’t know how, if you can tell me how to do that I’ll be happy to share that with you.