Hi, I am beginning to gather the basics for a paludarium. I am a somewhat experienced aquarium caretaker, and I would like to add some terrestrial variety to my collection of ecosystems. For those who are unfamiliar with the word (its a doozy, I know) a paludarium is basically a hybrid between an aquarium and a terrarium/vivarium. I would like to create an Amazonian environment with some cardinal tetras(imagine the common neon tetra, but with red running down the length of the body) which are a little more fragile than other similar tetras, but they are native to South America, so they would be a nice addition to a dart environment. I also plan to add Corydoras that are smaller, and perhaps more subdued in color, and would like to have about a dozen tetras and half that many cory cats. But enough of the piscean world where I have plenty of knowledge, and into the area where I defer to the experts here. I plan on a total of about 20 gallons of water, because I have already purchased an internal filter that handles... You guessed it! 20 gallons! Originally, I was thinking about doing a 24x24x24/30 cube with a false back to house the filter, and use the filter as a waterfall, because it is a whisper 20i, and would be easy to do. Now, however, I am leaning more towards something rectangular, because I think that if I did something like an L-shaped land mass where the foot of the L is somewhere in the left side, and the land is obviously along the back, with a couple islands with false bottoms to house hardware such as powerheads for river-like flow, and a heater. The left side could house the filter, and create a left-to-right flow for the tetras. I would create a slope on the right side, so any frogs that fell into the water could climb back out. I was gonna do just some simple cork wood foundation silicone'd in place, and then filled with a good substrate for planting, cork wall, plants all over, really beginner stuff that is hard to mess up. The "river" floor is probably going to be some kind of plant substrate covered with an inch or two of sand, and lightly planted with something long and thin, grass-like and stuff. The terrestrial plants are probably going to be just as simple and easy, maybe an orchid or two to add some flair. I am considering some kind of waterfall pump, as well as a misting/fogging system. For heat, a dual-lamp setup, with one for heat, one for the lighting-needs of the plants. There would be plenty of hiding places, in the form of coconuts, and litttle caves built into the cork wall. I have no idea as far as what to stock frog-wise, hardy species with bright colors are what I am looking for, if you could PM me with any suggestions about anything, I would really appreciate it. If I left any plans/ideas out that would be a good idea, I would really like to crowdsource as much of this as possible, so feel free to PM or reply!