Actually, adding fake foliage and branches is more than just pleasing your eye- if you're concerned with shy young ones, adding some of that stuff provides even more security for them.
It's great that yours are eating already, but a couple of mine would actually think your tubs still have too much open space to feel secure. If the tubs are in a rack, that's a different story. But being open to a room, doesn't hurt to add more security!
