That plant is fake.

I love heavily planted tanks, so think with plants you can barely see the frogs. I would plant bromeliads to start off with. Darts love them and some darts use them to their lay eggs in. I like some ground cover (besides the "live" oak leaf litter) and I use an oak leaf ficus for that. It has small leaves and spreads out across the bottom and up the sides of the tank, making a green carpet. If you can get your hands on tropical moss that will work too, but in a different way. My understanding is that it comes from Hawaii and sells out very quickly at Black Jungle. I also understand that you cannot use the mosses you might find in your yard, they just don't last very long in dart tanks. In my dart tank, all kinds of ferns popped up out of no where.