Does your shrimp swim around or they all just stay at the top and refuse to go down?
I think they dislike the new water parameter.
When you were editing the tank,you disturbed the sediment without realising it.
As water is added in, water parameter changed due to disturbed sediment mixing with your old water.
There could be a water parameter spike, do please check your water paramet and let us know your reading.
ASAP, as there is a chance that some CRS might died.









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