How large is your tank?
How many bubbles per sec were you dosing?
Was an air stone present?
Could it have been PH fluctuation that killed them?
Standard 20 gallon tank
I have a sponge filter in the tank along with the canister filter
I was dosing 1-2 bubbles per second, from the information I've gathered from other TPT member's help, yes the PH swings will kill the shrimp.