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lethal nitrate levels
> With 110 ppm of NO3 my fish should be dead by now,
> shouldn't it?
no, nitrates may not be _good_ for your fish, but they would have to
accumulate to _very_ high levels (>500 ppm?, > 1000 ppm?) to be lethal to
most fish, and under normal conditions, some other chemical accumulating
with nitrate would kill your fish first.
this being said, it's probably true that _some_ spp of fish are especially
sensitive to nitrates, but even these would probably not be killed at ~100
ppm for limited periods.