Sounds like you might have an incomplete shed going, it might be a good idea for you to either soak him in the tub or sink. A lot of the times I let them soak while I'm cleaning cages out in a small Tupperware filled with wet paper towels. I also will do this when I see them go blue. If his pretty active it will take care of most of the shed. Hopefully you have the UTH hooked up to a thermostat or at least a rheostat to keep it from getting too hot. You should definitely get a better thermometer I would think having the Light and UTH on at the same time would heat that small of a tank up to much but you could live where it's extremely cold I guess.