Welcome to APC!
I'm guessing you have enough light as I think I see some DIY CO2 bottles under the tank? How many watts do you have?
If that's the case, lot's of plants will go well with ferns. Check out the PlantFinder on this site.
Two initial comments on your setup:
- You need LOTS more plants.
- Replace the rubber bands with either thin fishing line or black cotton thread.
