You can make the tank work just fine. Mine does and looks good too.
As for keeping heat in a few things can help. You can get foil tape from a hardware store and cover most of the screen top leaving portions uncovered for heat lamps and ventilation. The other big help will be putting something like thin foam, neoprene, or even thick Arty paper on the sides and back. This will insulate and add a feeling of security.
Now if your current bulb is giving you ambient temps of 80 you are good. That is a prefect air temp. You do not need the air to be 90 degrees, you only need to provide a hotspot with the uth at 90 degrees. If your entire tank is around 80 degrees it is good and does not require another bulb or che.
A good thing to have is a IR temp gun. This will make providing the proper hotspot much easier. You need to make sure that the bulb setup does not create a hotspot under the bulb higher than 90. Just because the eminent temp is 80 does not mean the bulb is not creating a hotspot over 100. This is where the temp gun can really help out.
A good trick for a glass tanks is creating humid hides. This can be as easy add placing damp moss in the hides or making a tupperware style container into a hide containing moss. If you go that route placing the hole in the top of the container usually works best.
Alot of your setup is going to depend on your room temp. I have a avg room temp of 68 and on my 40 gallon tank have to use a 100 watt che, UTH, and a sixty watt bulb to keep the cool side correct. It can be done but will take alittle time to get it dialed in.
Also for a smaller snake it is good to add items in the cage to provide cover to help the snake feel more secure. You can get as elaborate as you want but make sure you are ready for maintain the environment you create.
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