Please help!! I had my pastel male for about four weeks, he ate once a week except for last week, which I noticed he started his shedding process. I made sure to not bother him, raised the humidity, always had great temperature, had everything great. Then tonight I came home and found him upside down dead with some blood next to his mouth on the paper towel....He didn't have any signs of a respiratory infection that I could see, no odd behavior....what could have caused this????

Thanks in advance.