Hi Amy
I am trying my hardest to keep plants with my discus. I;ve just started adding ferts in an attempt to make them grow
The only plants that are doing well is giant vallis and a hygrophilia
the amazon swords, vallis and echinidora are struggling. Oh I forgot the crypts are doing ok as well
Theres a few popular ones on there such as microsorum pteropus (aka java fern), various anubias, (vallis, crypts and swords as Simon mentioned too) even the crinum's might be suitable which are bulb plants. If you check their requirements and check it with your lighting you should be able to do well.
I'd keep the lighting on for about 6-7 hours... i imagine nutrients might be useful, i would ask about that in the planted forum though. Tropica plant nutrition plus is what I use if you are looking for a decent all rounder