This can't be right, but I thought mg/L convert straight across to ppm. Which means that 157ppm of nitrate equals 157mg/L of nitrate. 157mg/L of nitrate is extremely high, is it not?
Perhaps one of the fish died of natural causes, thereby causing a spike. If you have a large amount of bacteria, in theory I would think a spike could run through to NO3 in less than a day. Did one of the fish die first, then after a period of time, the rest?
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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