Great, sounds like you are right on track! Vampires would probably go after the shrimp, but i never had much issues with them being territorial. FT shot is a full tank shot from the front (or main viewing point)
For aquatic plants, crypts would look great, or hygrophilia as it will grow emersed too! I have a friend who has a 75 gallon vivarium with darts and 100% emersed aquatic plants.
A personal favorite plan is ficus pumila. Its a nice vining plant that will help break up bare spots in the background. Crabs love to climb it as well.