OK, so we all agree that the tests are wrong for some reason and if we had accurate test we might discover the prolem. Since we don't, let's go to plan "B". Nitamtn, you have done this water change/ clean several times in the past successfully. You sound like you know what you're doing. Was "ANYTHING" different this time? It may have not been your fault. It may be as simple as your local water company putting some sort of additive in the water supply. How are your remaining fish doing now? Maybe check with your water Co. If that's what happened and the water is OK now, do another water change. Maybe everything will be OK then.
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