i'm kinda guessing you're going to be looking for plants that do well in low light, if that's the case, you can't go wrong with java fern, java moss, anubias, and crypts. all of those plants should do well in tanks with around 1 wpg, i have about 1.5 wpg and i have a bunch of cryptocoryne wendtii, anubias barteri, java fern, amazon sword, red melon sword, and brazilian pennywort.