Ok so here's my upgrade, added a new perch right under the heat lamp. Total 3.
(note only upgrade was one more perch under heat lamp)
Exo terra 18x18x24
This cage is not large enough. If you can get him eating you can use a bit but it will not be able to live its entire life in it.
HEATING:
Perch under heat lamp 100F.
Middle perch 91F.
Front perch 82F.
Note all temperature were taken from the left side of the cage closest to heat lamp.
From your note Im guessing these were taken with the analog thermometer? Not the best, but at least its something. The first perch is to close to the light and to warm. The hotspot should be 88-90. 100 on the side of the stick means directly under the stick is going to be much hotter plus if the snake was to coil on it the snake's back is even closer to the lamp which makes it even warmer. The other two perches are good so I would move the top perch somewhere below the second.
HUMIDITY:
85-90% and dropping slowly thru the day down to 65-70% when reaching night time.
Your humidity is good.
LIGHTNING:
Daylight:
40 watts zoo med day light heat bulb.
T8 flourecent tropical 25 UVB from Zilla.
Whatever size bulbs works is good. If it turns out you are between sizes you can always get a larger watt bulb and place it on a dimmer to turn down the output. The snake does not need UV so maybe some of those plants are live. That's good if they are, it helps humidity.
Nighttime:
40 watts zoo med night light bulb (red)
usually off because temperatures stay between 70F and 75F.
None of my cages ever get lower than 75F. I would turn that night lamp on each night and keep the temps up. Nothing bad will happen with supplying good temps all the time, but bad things will happen if bad temps are offered even some of the time. This is also related to your question about the substrate temps. I like to keep my cage floor no lower than 75. That gives my snakes a great range of options but they are all still within the ideal range. These snakes will come down at night and crawl around. They will swim in their water bowl, if large enough, and sometimes coil on the ground and just chill. With that you don't want your snake going down there and getting to cold.
Emerald tree boa perching on middle perch (temp 91F)
https://ball-pythons.net/gallery/fil...3/img_0374.jpg
Your cage looks nice and I think you are close to getting it correct. You want the perches to be on three different levels instead of close to the same level. Id move the one showing 100 down below the other two. Go here and check out there pics. You can see how they stagger and distance there perches. If you go through "Design Your Cage" it has different pics for each size. You can just select them to see the different pics. http://pvccages.com/
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