I got my pastel ball python about a month ago from a guy who did reptile convention shows and I've been noticing a whistling sound coming from him occasionally. The humidity stays at about 40% but drops down to 20% about mid-day (high-tech hygrometer tells me this). The general air temp is about 75, the substrate on the warm side is about 90, the substrate on the cool side is about 80. In the middle, the substrate gets cold because its kind of a long tank. I use the eco earth coco fiber substrate but he was previously housed in a newspaper habitat (I wanted something natural). My first guess is that the tank isn't well ventilated because he will climb up to the wire mesh top and kind of just keep his head by it (where the fresh air is in guessing) but I could be wrong and the air could be fine, I do spot clean daily and change substrate every month. I could post more but It might get into very tiny details and it might get long. Please help. I'm ok with taking him to a vet but they are an hour away and the roads are icy around here so if I can fix it on my own, I'd rather do that