My ball python is wheezing a little. Sometimes when he moves around in a funky way I can hear him breath, and I'm pretty worried. He did just shed and eat, so I don't know if that could have anything to do with it. Hes gaining weight and still exploring around and eating fine, and he's not breathing out of his mouth. I managed to open his mouth with a card, and there's no extra saliva or anything. What's going on?