Mite infections are very often accompanied by your snake soaking in his water bowel, assuming it is large enough. If your snake has mites on it they will either be: (a) underneath the scales and too small to see, or (b) they will be visible, black and moving around on the surface of the scales. If it is black and not moving, it is unlikely it is mite. They come off pretty easily once they are out from under scales.