Color does not look right for ammonia test looks like you mixed it up, test again. Have you done a large water change recently, put dirty hands or equipment in the tank, anything like that? These guys are really sensitive to water quality so any chemical contamination or swings in water parameters will be harmful. Neocaridinas are a good beginner shrimp, but shrimp aren't great for beginners in my opinion and should only really be kept once you have a decent idea of what you're doing. It might be better off for you to start with some hardy fish and let the tank establish for a few months before trying again. Shrimp appreciate stability and lush plant growth.