Shrimp by themselves will not create a rapid ammonia spike that fish normally would but they also cannot survive in pure water by itself.
The act of seeding the tank means bringing bacteria from an established tank to the container where your shrimp will be. This means transplanting water, plants and filter media. If you drain the water from the established tank, take the water from the top and not the bottom where the waste is.
You neglected to specify the type of shrimp involved so any answers provided would be generic and limited at best.
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