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Do you have any visible algae in the tank... green hair algae etc? If so, then the phosphate is bound up in the algae and will not necessarily show up on the test.
I've never tried that kit. I have the Hanna ulr for PO4. I have no idea how accurate it is, but at least I don't have to try and differentiate between light green, slightly lighter green, and greenish...This test is good ? Can i trust? ... because i make a test in my 5G nano .. 4 times already and every time the result is "0,0" PO4 .. thank you everyone!
Ive used it and it was accurate back in 2013. Ive also used red sea with good results. If its not expired and you dont have algae, i would say you are good.


