Hey Sauzo you going to do live plants? I am really tempted to get some humidity control and because some vines would look amazing in a pvc cube. A few people on some of the chondro forums are talking about it and seem to love the benefit. I have a great grow light I may pick up if I go that route. No bio active shenanigans or substrate... puppy pads and a plant in a pot is what I am thinking of. Simple and easy to clean.
Thinking either philodendron or pothos because they are easy to get and easy to maintain.