If you are using a T5HO UVB with a 5.0 or 6% bulb you want a measured Distance of 8-9 inches to the branches right below the fixture for the correct uvb. I would cross latch main branches to support poles. This makes them stronger. You can see examples of this in my album https://www.chameleonforums.com/media/albums/my-enclosures.6672/Progress! Feeling good about the structure, but would love any feedback. Going to be starting to reintroduce plants here soon.
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