It looks lovely, Harrison.

Everyone does things a little differently....It makes a big difference 'where' the tank is.
Air conditioning and heat in the winter months will force you to modify things as needed.

I have a uvb bulb hanging 'near' my tree frogs enclosures....but not that close. I doubt it's doing anything. I actually have it closer to the moreletii ( black eye tree frogs) My tanks are tall.......36".....I need an additional heat source most of the time. I use regular base philips plant bulbs 75 watt ( home depot) in the winter and 13 watt led in the summer. ( all my tanks are in my basement... there are 36" fluorescent plant bulbs in the overhead fixtures)

I doubt you will - ever- get a 100% agreement on the need for uvb. I keep it handy for froglets.
The is no doubt they are more active at night without the red light . My tree frog tanks are very , very 'bare bones'. No substrate no background. ( reason > cleaning )

They are not good swimmers......they will get very used to the water though, as long as they can get out easily and safely.
I think your water change idea is really great ! Very handy for you as it's so important to keep the de-chlorinated water clean.

Funny story. I used to have an elevated area of water running in the red eye tank. I kept a pc of plexi floating in a 50/50. It was rigged so it would not sink or tip. They could sit right in the very shallow water on top of the plexi. I had the water pumping up through the middle of the plexi. It was pretty. However, I ended up removing it ... 1) because of the maintenance and 2) because the frogs use to sit in the water and go after the bubbles thinking they were food. Good gosh!

Red eyes are not the sharpest tools in the shed They bolt when they are startled....so those of us who keep them need to remember ..nothing pointy for them to impale themselves on. For example, we have seen some really bad wounds from the wire in fake plants! They will appreciate nice big flat leaves to sleep on. Mine love Dracaena leaves. They will enjoy your live plants !

As for the higher humidity at night...it's probably ok as long as it is well ventilated.
I see you left the top all screen.....that's good......as long as the temps are not a problem for you . If the humidity becomes a problem---you could run a little fan. A computer fan , an aquarium fan ( electric on a timer ) or personal fan ( AA batteries ) . I use a double aquarium fan ( Fosters & Smith).
I set in on the screen top ( area) between the 2 tree frog tanks in the summer. Most of the screen is removed from the top of mine though ( to help w/the heating needs). ALL of the screen is removed in the PDFs. ( all - replaced with glass) There are times( in the summer) I run a standing floor fan and let it oscillate. You will get to know exactly what you need to do to maintain things for the room your enclosure is in

fan:
Fluorescent Aquarium Lighting: Cooling Fans

Have fun!