Cash, my retic, recently passed for the first time since I've owned him. Everything about it looked normal ( normal urate, normal shape, etc.) except for the color. It was very light colored, almost a greenish-yellow rather than the typical brown. He hasn't shown any symptoms of any diseases (no lethargy, eating well, normal snake behavior) so it's entirely possible I'm just being paranoid, but I'd rather be safe than sorry.