H. zosterifolia is an excellent choice for midground applications, as are Rotala rotundifolia 'Green' and Hottonia palustris. It really depends on what effect you want to do.
Hygrophila corymbosa "angustifolia" really is a background plant. It's very long, wavy leaves can reach up to 6+ inches long and grows straight upward like its broader leaved kin.
As for what will compliment the Pantanal better, it really does depend on what your tank as a whole looks like. Personally, I wouldn't go with either. I'd opt for something like Rotala sp. Nanjenshan, but, as with many aspects of aquascaping, plant combinations are mostly a matter of personal preference and style.
Carlos
Hygrophila corymbosa "angustifolia" really is a background plant. It's very long, wavy leaves can reach up to 6+ inches long and grows straight upward like its broader leaved kin.
As for what will compliment the Pantanal better, it really does depend on what your tank as a whole looks like. Personally, I wouldn't go with either. I'd opt for something like Rotala sp. Nanjenshan, but, as with many aspects of aquascaping, plant combinations are mostly a matter of personal preference and style.
Carlos