Ok, I put a 'ReptiTherm' under tank heater on the bottom of the terrarium and installed a new hygrometer. I'll move the water bowl to the centre and once the temp comes up I'll shut off the heat-lamp to see what happens. I'll keep misting until this shed is complete and hope that the next goes better. Where is the best place to put the thermometer?
Thanks for all the input; I'll keep you posted. Bela is a really sweet snake (there's a term I never thought I'd use for a reptile.. but it fits). I hope I can provide a good environment for her.