Hello everyone I'm new to this and i have a about 5 month bearded dragon and i changed his substrate in his tank to being newspaper from a mat for reptiles. He was perfectly healthy before this but i looked into his tank tonight after changing his substrate and his beard was completely black and half of his upper tail was black and there was throw up in his tank. I'm freaking out because it's the first time I've ever seen him with such a black beard and I'm thinking it's because i made such a radical change to his environment but i just want to make sure it's nothing else