Hi @Lasse, interesting thread, thanks! I was not aware of the problem of nitrites in interfering with nitrate test readings. A few questions:
1) By how much does the existing nitrite affect the nitrate readings? E.g. if there is 0.1 ppm nitrite, how far off will the nitrate reading be?
2) Is it possible to have nitrites in an existing tank, over a long period of time? Or is it only a problem in a new setup? My nitrates always used to run around 20-30 ppm and I have now got them down to about 5 ppm, but I am wondering if the previous high readings were artificially high due to existence of nitrite, and my apparent drop in nitrates is really because the nitrites came down.
Hello,
sorry, only in german:
best regards,
Christoph