Hanna Nitrate HR test kit

[just_use_soap]

I have a Coralife Biocube 32 gal that’s been set up for over a year. Just switched to a Hanna test kit, it’s showing my nitrates being really high (35 ppm). I got my water tested at my lfs and their Red Sea test kit came back with 0-10 ppm. Is something wrong with how I’m using the test kit? I followed the instructions to the letter, and I did 10% water change just in case there was something off.

 

[KrisReef]

Welcome to the test kit conundrum.

They are probably not both right but which one is it?

 

[Randy Holmes-Farley]

Maybe neither. lol

I’d trust the HR in my hands over someone else using a different kit. You could also try it on some new salt water to see that it reads low there.

 

[Ryan15236]

I get 30-35 with my Hanna HR and 0 with api. I was getting some really inconsistent results with Hanna checker but I have that sorted out I believe. I’m still going with the Hanna checker for now