you need to get something smaller. with something that big you are just going to have problems and its going to drive you crazy. how big is the snake that is in there? with a tank that big you really need to make sure the ambient temp is atleast 80. you can cover the top of the tank to hold humidity in but leave a circle where you can put a heat lamp to keep ambient temps up, unless you have it in a room where it is 80 constantly