Bright,

Just out of curiosity what is the ambient temps in your house or better yet, the room your snake is in? A tub is the best setup for keeping the proper conditions for your snake. I have read many of your recent threads and it's obvious you truely do want to do what's best for your snake. That being said I am sure you will get everything ironed out and your snake will be fine. Don't freak out just yet, even if it is an RI they are common and easy to treat if cought in time. For the time being I would try and figure out how to keep your temp from dipping at night.

Maybe a small UTH/thermostat on the cool side would keep your temps up? Regardless, keep us posted on how you make out.