My chinchilla Xan is about 2 or 3 years old. He has no prior problems or anything. I've noticed he either does not eat or barely eats. He has lost weight but he was a tank so he is not skinny but lost some chunkiness. He will eat oats and alfalfa hay all day if I let him. What is going on? Should I switch to a new food? I currently feed him oxbow chinchilla food, its just pellets for those who don't know, and occasional oats and cheerios but he was never that fond of the cheerios. He is drinking and chewing on the wood sticks just fine, its just the food. I'm starting to worry about him, any help would be great! Thanks.