Plants for WTF Enclosure

[Whitestree frog]

i had an idea here

[daybr4ke]

While in theory you might not need substrate, some sort of substrate, even paper towels as elly mentioned make cleanup a lot easier. Without any kind of substrate a standard design would require cleaning almost every day to remove residue to prevent bacteria growth. I find your design very interesting, it would still require cleaning every day or every other day, to avoid buildup of fecal matter and urine residue, since this can allow bacteria to grow.
Coco fiber can go 2-3 weeks before replacing.
(Also applies to peat moss, topsoil etc.)
Paper towels require switching each day, since they allow bacteria to grow rather fast, but are generally easily available and require no special purchases.
A planted tank with drainage layer or false bottom can go without switching for as long as a year. Maybe more.
This is why I like making full planted tanks with microfauna(springtails and oppose). They look great and require a low amount of maintenance, but they take a lot of time and effort to set up, Not to mention money and plants. I know it can be a pain to switch out substrates, but substrates are used for a number of reasons. I hate to say it, but I feel like you'd be putting in a lot of work for very little benefits. You'd have to build it, and clean it. I kinda feel like that's more work than the substrate.