You should get your ammonia spike in a day or two. Once it reaches 1ppm remove the shrimp and test for your ammonia to drop and nitrites to develop. Nitrites will take a while to go away. Ammonia disappears faster. Just have patience. When your trites and ammonia are zero you will have nitrates. You can do a water change to lower your trates and your good to go. Once your ammonia is zero and you are testing trites test every few days.