I have three wild Peruvian monos (2") that I'm currently growing out. I also have two much larger peacock bass (12" mono and 16" pinima) in another tank. I'll post pictures of all of my peacock bass at some point in the near future.
Valisneria(river grass)
Hornwort
Sword plants
Java fern
Java moss
Moss ball
The easy stuff,cheap and the bass are pretty good about it,i see a huge diff in my water quality,i tried some stick type plants,but they dont stand up to MONSTER fish