Indian almond leaves, mulberry leaves can be given to shrimp to change up their diet. I often sell organic mulberry leaves from my own mulberry trees! So you know they are safe and quality is guaranteed.
Shrimp love a variety of fresh vegetables, just give them a quick blanch before putting them into the tank. Some favorites include: zucchini, cucumber, spinach, and the occasional carrot.
Any kind of algae wafers or tropical fish flake food is a suitable for shrimp. My shrimp particularly enjoy the Tetra Color variety. I purchase it in bulk from Amazon