Live aquarium plants are VERY important when keeping shrimp. They provide homes, hiding places and also a site where the shrimp can feed. However avoid planting difficult, demanding or high light requiring plants, and instead chose plants that can tolerate lower lighting and don't need lots of nutrients or CO2. As such mosses are absolutely fantastic for shrimp, they provide lots of lovely places to hide and act as a good place for tiny algaes and bacteria to grow on, providing food for both adult and baby shrimp. I also like to plant the front of my tanks with dwarf hairgrass, my shrimp just love to explore in it and feed on any algae growing on it.
I remember reading that to some shrimp like amano shrimp, planted tanks are like an alien world, since they naturally come from rivers and streams apparently devoid of plant life with a smooth rocky bottom.