I use a 33g for my female. I also bred them in it.
The lights took some adjusting. Now I have an UTH under the waterfall and the silver dome is gone and the only one light bulb is in the canopy light because the cool side was not cool enough.
Also I had to cover up some of the screen to help hold in some humidity which is the biggest problem with open top cages. All the heat and humidity rises straight out the top. They can be used but they take more time and effort to get them to work right for arboreals. I have to mist a lot more often than I would if I was using a front opening cage.
As for a florescent light, it will benifit you more than the snake. ATBs don't need UVA/B bulbs and sleep all day so the only advantage to using it would be to brighten up the cage. There is also not enough heat generated from a florescent light to increase your ambiant.
Cheers,
Trevor