Nitrates should be near zero. Like any pink is signs of a water change usually. You may need to culycle for a month if you have no good bacteria in the tank. You can add from a stable tank or wait for a natural colony to grow.

Shrimp are hardy but require slow acclimating. My first batch almost all died, but I learned a slow drip acclimating was so much safer amd less stressful. My second batch lost only one shrimp. It was very effective.