Hello! First off let me thank you for taking the time to construct a reply and for your insight!

Now to begin in your first paragraph you suggest looking up some youtubers for some tutorials and since reading your post I've done just that! I've been checking out Serpa Design and his DIY channel, very informative stuff, if you had any personal reccomendations of other creators who are good I'd be open to hearing them. Also - I agree that I think the second aquarium would be a better fit, I just wanted to gather a second opinion, so I think I'll be going with the 20L X 18 W X 24 H.

To your point about the foggers thanks for the heads up! I was unaware of functionality issues they had, I will for sure look into getting a proper misting set up for the enclosure - and thank you for the advice on the pump/water set up for sure wouldn't want to introduce harmful microbials to my enclosure.

After Supplementing your suggestion of the fire belly toad with some research of my own I'd tend to agree that they'd seem like a better fit for the enclosure than the other two species, so I'd be more than happy to make them the species for this tank.

I am open to doing a practice vivarium on a smaller aquarium before I take the plunge on a larger one but my biggest concern is any frog I put into a smaller set up may not have the space to live comfortably. so If I were to take on the endeavor of constructing a smaller vivarium say ten or fifteen gallons what species would you recommend I look into - if any at all? If I were to establish a smaller vivarium I'd want to house something other than the fire belly toads since those will be in the larger habitat.

Thanks again for your time, and kind regards,
Spencer