OK, I've rejected the 55-gallon tank in favor of a 20-gallon for my new and first python. He's in shed now, with clouded eyes and dull skin. I'm keeping him in an upstairs room where it's warm--mid 80s--but not warm enough, and relatively humid, 70 percent, which I'll dial back when he loses his skin. I'm ordering a UTH and am looking for advice on which one to get. Will a Cobra mat with a ReptiTherm 500R do the trick? I'm thinking I can add more fixures come winter if needed with that setup, perhaps even a CHE if it comes to that. Does the Cobra work well under the tank (which I think I would prefer)? If it goes inside the tank, how does that work--under substrate (I'm using newspaper) or above? The one from ReptiTherm that has an adhesive doesn't seem like it would put out sufficient heat. Any other recommendations on UTH? Thanks.