ImACoolguy
Aquarium Advice Addict
Nitrate is zero, because it's a cheap API or nutrfin test kit with two liquid bottles, I have same problem on my FW co2 injected tank, real NO3 are 10-15ppm, and my test says me zero.
This is because thoses test are cheap. Also, nitrate test botle #2 or #3 must be shaken like hell before a test to get a result.... Can you retest nitrates just for fun by shaking, bagning the bottle on a table/floor, shake it like if your life depends of it... It changes a lot the results, I experienced it before.
Anyway, low/high (<60ppm) nitrates don't kill fishs. Im my reef, my real nitrates are <0.05pm, nothing dies...
I have API and mine has never read zero in a cycled tank.. Hmm... I agree try a retest and shake the life out of bottle #2
Caleb
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