Cool thanks for your help guys. Although your help has led to another question

Since my vivarium is a biotope, all the plants and animals have to be found together in nature. Any suggestion on plants found in the tropical rainforests of northern South America?

I may pick up some plastic plants, but they will be short term as I want to keep everything in the tank live.

Also I see a bunch of terrarium plants at PetCo, but they dont have them labeled. They just say either "Tropical Plant" or "Desert Plant". Any idea how to identify them? Maybe I should visit a plant nursery...