Hanna Nitrates reads lower than API test

[rc1]

Quite a difference, can it be that far off?

 

[KrisReef]

Yes.
These colors are apples to oranges in hue. :beaming-face-with-smiling-eyes: :cool:

 

[Randy Holmes-Farley Verified Community Expert]

test kit disagreement is more the norm than not, but might there be nitrite present? Nitrite can interfere with different nitrate kits to different degrees.

 

[mimi117]

I am experiencing the same thing man! @rc1

If there are any nitrites in the tank, it throws off the reading for nitrate.

I think we need to wait until nitrites are completely gone to do an accurate nitrate reading. (assuming you have nitrites in your tank)

 

[rc1]

I am experiencing the same thing man! @rc1

If there are any nitrites in the tank, it throws off the reading for nitrate.

I think we need to wait until nitrites are completely gone to do an accurate nitrate reading. (assuming you have nitrites in your tank)

No nitrites or ammonia for the past 2 years

 

[KrisReef]

No nitrites or ammonia for the past 2 years

No API nitrites?

 

[rc1]

No API nitrites?

Ammonia 0 Nitrites 0 Nitrates 45.9 and Phosphate 9-10

 

[KrisReef]

Ammonia 0 Nitrites 0 Nitrates 45.9 and Phosphate 9-10

These were gathered from API test kits, or Hanna?