a fecal test cant tell u if ur snake has a RI, it will tell u if ur snake has internal parasites. only a culture can tell u if ur snake has RI. ur snake might have some stuck shed in its nose that is causing it to whistle a lil bit. RI's normally sound like popping in its throat or gurgling or even worse. my normal sounded like a duck at one point when it tried to breath. ur cool side is a lil bit too cool. try to get it up to 80 atleast, i dont let mine fall below 80