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Interesting read and nice tank. If you have hatchets in there, I assume the gap from the surface, to the top of the tank is quite high. Have you considered keeping splash tetras, Copella arnoldi? I have a 5 foot setup which is a riparium of sorts I guess and they spawn in here from time to time - it's great to watch them jumping out onto leaves!
Also, have you considered Echinodorus as a genus to try? I've found that one of my random Echinodorus that was barely growing submerged is now growing amazingly once it uprooted and got caught on oak branches about 3-4 inches below the water level. It is now taking over my tank with leaves that are pushing against the lid which is more than 12 inches above the water level (the leaves are around 7-8 inches by 3 inches wide and a new one grows around every 3 days at the moment. I've also found Hydrocotyle leucocephala to be a great space filler too (although it needs trimming around every 3-4 days as it goes crazy - but humidity in mine is very high as it has a lid).
Also, have you considered Echinodorus as a genus to try? I've found that one of my random Echinodorus that was barely growing submerged is now growing amazingly once it uprooted and got caught on oak branches about 3-4 inches below the water level. It is now taking over my tank with leaves that are pushing against the lid which is more than 12 inches above the water level (the leaves are around 7-8 inches by 3 inches wide and a new one grows around every 3 days at the moment. I've also found Hydrocotyle leucocephala to be a great space filler too (although it needs trimming around every 3-4 days as it goes crazy - but humidity in mine is very high as it has a lid).