Red shrimp dying

Can see a few red shrimp collapsing.. as in like dying.
They still jump around though.
I know the tank cycling is not complete, so i can only think of topping up more of my other fish tank water(actually is the sump tank water) to here, bringing the ratio between fish tank water and tapwater higher.
Now the tank is around 50% full of water.
The lights are also out now, so hopefully tomorrow i will have some survivors.