Personally I would pick up one level of an ARS 70 hybrid rack with a grey tub, you can get one with heat and tub for about $100. I would get it out of the glass tank ASAP. I had a Woma Python in a glass 40 gallon breeder, was mean as they come banging his head on the glass trying to bite me. As soon as I put it in the rack it totally calmed down the snake and was docile in just a few weeks. Rat snakes are known to be one of the most aggressive, should be a good challenge!