How long has your tank been set up? If it's fairly new, your PH is fine. Mine was around 7.7 for months. Then it rose on it's own over time. What's most important is that it doesn't fluctuate greatly. As long as it's stable, things should be fine. I doubt it would kill your shrimp unless it dropped quickly.
Alk should definitely be tested as stated above. If the shrimp is dea, I assume you took it out. If it doesn't get eaten quickly it will just rot and poolute the water.
Good luck
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