Re: No ammonia, no nitrite, repeated fish kills
PH swing due to co2 injection doesn't affect the fish as an actual ph swing because the actual is also affecting gh and kh. Fish being lethargic due to co2 is most likely caused by to high of a concentration of co2.
OP can you take a glass of tap water and let it sit for 24 hours. This will give the actual reading of your tap water after it outgasses. Out gassing usually causes the ph to rise unless you have unstable kh and gh. and readings are low. Can you get readings of the gh and kh also your TDS? You can have any good lfs to test that for you. sometimes even a pool company will test it.
I wouldn't put anymore fish in the tank until we can figure out what is causing these problems.
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