I'm not sure which one of us you are speaking to here.
If you didn't catch it, our royal is no longer in a glass enclosure, hasn't been for some years now. I recommend plastic enclosures for most snakes and we only use them for the snakes we keep here. These are Pro-Line cages from Constrictors Northwest.
The royal's cage is up top in the photo and the boa constrictor's is the taller and deeper bottom enclosure. The last enclosure is for a coastal carpet python. All cages use Herpstat thermostats, and are heated by Pro-Products radiant heat panels.
If you enjoy backgrounds, these, sans the royal's cage, have durable rubber backgrounds. They are cosmetically pleasing but cost a few $$.
Though I still have some digital thermometers in the cages, I get better area temps using an infrared heat gun.
Even still, after all I've stated about the preference for plastic cages, I would not hesitate to drop the royal back into the glass tank as she did just fine in it.
That unit is now controlled by a Vivarium Electronics stat for ambient temps, and a Hydropharm for the UTH. It is not in use at the moment but it's nice to have as a spare.
I agree, the OP should have a thermostat, and a heat gun is a very handy tool.
The biggest gripe I had/have with the 40 gallon was/is top feeding and cleaning. I agree that front opening cages are easier to deal with. Jeanne, I like that cage you posted.
Royal top. Boa bottom.
Coastal Carpet Cage.
Apologies to the OP for getting slightly off topic.
As stated, the "picture background" shouldn't be too hard to find. They do look nice IMO.
There are multiple options, just cut to size.
https://www.amazon.com/s/?ie=UTF8&ke...t7etiugz_b_p13
You can wrap the sides as well. Put the Refletix on the outside and tape it with foil tape.