Iv been trying to feed my snake every week and he hasn't ate for I would have to say about 4-5 weeks. He has lost about 20 grams my dad said. I have had him for a little over half a year and he has never had problems. He is about 8-9 months old. I haven't had a hygrometer in his tank for a while and I finally got another one in there cause my old one broke. The humidity is rarely under 50% and the temps are ideal. His tank setup is a 40 Gallon Breeder and I use aspen as his substrate, he has 2 hides and some fake plants. He has 2 red lamps above and a UTH under the hide he is always in. He stopped eating after I switched him tanks, he went from a 10 gallon to a 40 gallon. He has always ate live, first mice and then rats, he didn't even have a problem switching from mice to rats. Any advice is appreciated.