My personal experience with rubs has never been good and was never able to maintain correct temps without the room it was housed in having the correct ambient itself. I felt exactly what you are.For all the messing about that went with it I went with a viv and a ceramic as it was a pet and felt it looked better on display anyway. Not what you wanted to hear and someone may give you better news but that was my experience.
Jack of all trades, master of none.