Hi, my tank water is normally 8.1 with a GH of 200ppm and a KH of 100-200ppm. I found that Hygrophia Corymbosa Augustifolia grows well in my tank. It has slender long leaves that wave in the water and looks great. Also, what does well and is surprising is Pogostemon Helferi Downnoi. It's a foreground plant. Just keep cutting off the tops of the plants after they grow out a bit. Very easy to start a carpet with them. The Hygro is also a stem plant so you can also cut the plant and replant.