Such a pretty paludarium! And so nice and clear/clean. Great job!

You could use 100% aquarium silicone to add decor to the back wall if you'd like. It takes a good few days to dry/cure, so you'll need to move them to another temporary tank while the time passes.

To hide your false bottom you can paint the front of the tank at the bottom with a mixture of acrylic paint and Titebond III glue or you can fill that area with hydroballs or gravel.