temps over humidity, temps will cause issues quickly humidity has to be extreme ends for a while to cause problems and for the most part humidity can be solved with a humid hide.
Don't get frustrated. There is a learning curve, and there is no right and wrong just variations of working and not working.
Tubs work great if you can heat the space but not so great in cool rooms for some unknown reason to me many here recommend tubs to beginners when there are many posts about heating issues like yours.
I have not tried this 'fix' myself but it may work. I get the not wanting to buy more t-stats. You might try placing the tub in a cardboard box on its side bigger than the tub is but not too much that should keep some of the draft off. A human heating pad on low fixed to the back of the box at least 1 or 2 inches away from you tub should help to increase the ambient temps that circulate inside the cardboard box. Basically you are making a mini 'snake room' for your tub to stay in. Hopefully the heating pad will lift the room temp to the mid to high 70s and then the system should work for you. This isn't a get fix but it should work for now. That will buy you some time to plan some method that will work for your situation.
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