I'm still having issues with nitrate reading, if I put it in front of the card it's dark if I hold it to the side of the card in front of the light it's light, maybe someone can help me with how to correctly read this and tell me if it's to high? I'm guessing 20-30 as 40 shows through the tube on the card but 20-30 is barely visible
I do dose 14 ppm weekly with my ferts as well and it's been 9 days since my last water change
Tests https://imgur.com/a/8tCVZ
I do dose 14 ppm weekly with my ferts as well and it's been 9 days since my last water change
Tests https://imgur.com/a/8tCVZ