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I'm really sorry this happened.
You don't state the measured PH level of your Tanganyikan aquarium. But, I suspect you were buffering and adding some components to keep the PH and water hardness levels high for those tanks?
These are all things that can make a Chlorine/Chloramine surge in your tap water that much more lethal.
And yes, municipalities can sometimes 'shock' or surge the chlorine/chloramine levels in the tap water.
For no other reason than, well.... the day ends in a 'Y'?
I suspect that a Chlorine/Chloramine surge or shock, that was administered to your tap water system. Is what ultimately killed those fish. :(
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