neon tetras have been kept successfully in aquaria without any special water adjustments for more years than any of us has been alive.if all of your parameters are as you say they are;then there is something else affecting your fish.
could be gill flukes;could be an internal parasite;could be something else..i don't know that much about fish so all of this is just opinion.
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if we ignore nature;maybe it will go away
10 gallon..nothing but air
10 gallon...just more air
10 gallon...stale air
just don't ask about the rest
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