My last thread didn't get any responses so I guess I'll try again with a more focused title. I'm interested in setting up a riparium or paludarium type enclosure with an electric catfish. This would involve a tank half filled with water, leaving air space for terrestrial plants and perhaps a few small arboreal lizards, but that's not the main focus. My question is what size tank should I start with? I figured if I can use plants and increased filtration to keep the water clean, I wouldn't have to use a tank much larger than one that would otherwise be required for an electric cat. So my question is, what size tank do you suggest I use? I'd want to use one that could house it for a while, preferably up to the point when the fish reaches about 18". All help is greatly appreciated.