Hi, I am preparing a vivarium in which I intend to keep Fire Bellied Toads, but I am having many problems trying to get the temperature right. I have a heat mat attached to one side, and a heat cable underneath the substrate. I am getting temperatures of 21-25 or so degrees (Celsius), which is fine, but when I move the temperature probe up slightly, I get a radical drop of between 8 and 10 degrees. Does anyone have any advice on how I can bring the air temperature up in there? As I don't want to discover toads with fire on their bellies and ice on their backs! Also, there is a large bowl where I intend to keep their water, would this need to be warmed up and if so what sort of temperature will it need to be?