Oh, it's not 70ppm.. it's around 15-25 ppm of NO3. It had been up there in the past though, that's how I know it affects the fishes.
Naturally, the tank is around 8ppm of NO3 through the tank's processes. NH4 is converted to NO3 really fast because the substrate is really mature, really mature and lots of plants like NH4.
I add 1/8 of a teaspoon of KNO3. Any more would bump it up too high for my 29G tank. PO4 is always present (1-2 ppm). The only thing I dose regularly is KH2SO4. My tank is by no means perfect that's why it's good to read and experience.
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Algae happens.
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