is it that way with all NO3, PO4 tests?
Not with nitrate. Although zero (or just a trace) nitrates is desired, levels as high as 20 - 30 ppm are likely not a health concern for most tank inhabitants. But those levels of nitrate can lead to brown corals and nuisance algae growth.
Phosphate can lead to similar problems, but even fairly low levels can lead to serious health issues in calcifying organisms. So pretty much any level, detectable with hobby kits, is a concern to me.
Nitrite is of very little concern to me. If you're cycling a tank and the ammonia has dropped to zero then your nitrite will be down to zero within a week or so. And I don't think nitrites are very toxic either. Somewhat more toxic then nitrate but much less toxic then ammonia. Ammonia is the cycling killer, imo.
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