I tried vals once they just died but I only had 1.3 wpg maybe i can try again I haven't tried because I did not think I had enough light for them........And dont the dwarf sags stay pretty small? I want something more for the backgrounded........
I think most vals would do pretty well in that lighting and they also like harder water than most aquarium plants. I would lean toward jungle val as it is thick and may be more resistent to getting uprooted or munched by the fish.