Tested ammonia, no2 and no3 using 3 testing kits.
Ammonia= 0.5 mg/l, 0.25 ppm
No2 = 0.5 mg/l, 0 ppm
No3 = 100 mg/l, 80 ppm (this is the problem i guess)
Btw, I checked my tank logbook, last water change was 5 weeks ago. man days past so fast ><
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It is always nice to believe...