Yes it sounds like it's getting ready for a shed, you don't have to fool with the temps at all, but I usually like to spray them down with water when they're blue like that. It raises the humidity and makes it easier for them to shed. Humidity shelters are also nice at this time, it's just a plastic hide box (like a shoe box big enough for them to get inside completely) that's filled with some damp sphagnum moss. good luck.