API Test Kit not working?

Grack53

Alright, so I’ve had my API test kit for a few months, worked great in the beginning. However, I am now having issues. Basically I wanted to test the water on one of my 6 gallon tanks, I only tested nitrates. My nitrate results came up as 80ppm and, naturally, I panicked and did a 75% water change. I refilled and afterwards I got the same results, 80ppm. I waited until the next day and did a 50% water change and got the same results. I followed the directions exactly (shaking the second bottle for 30 seconds plus, as well as shaking the test tube for a whole minute plus and I waited the 5 minutes to read). I am puzzled by this issue, is my test faulty? Did it go bad? I did use test strips (the runbo ones) and I don’t think they’re as accurate but they never showed my nitrates to be that high in the first place, and the numbers decreased after my two water changes.
 

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Azedenkae

1. What is the nitrate of your tap water or whatever water you use for your water changes?
2. Any nitrite?
 
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Grack53

1. What is the nitrate of your tap water or whatever water you use for your water changes?
2. Any nitrite?
I can’t test my tap water now, but I remember when I tested it right after getting my test kit, it came up as 0. I have well water so there shouldn’t have been any major changes done by the city or anything that could affect my water. Nitrites came up as 0 (in my tap water and in my tank).
 
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FishDin

Have you tested your other tanks?
 
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jtjgg

agreed, test your tap water.

then you can dilute the tank water with tap water and do multiple test. the colors are a bit difficult to differentiate, 40ppm and 80ppm are very similar
use 3 separate test tubes and set them side by side:
#1 test tube 100% tank water
#2 test tube, 50% tank water, 50% tap water
#3 test tube, 25% tank water, 75% tap water (it should be more orange than red)

if not, then do a 4th test tube, like 10% tank water and 90% tap water, if its not orange then the test probably went bad.
 
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Azedenkae

I can’t test my tap water now, but I remember when I tested it right after getting my test kit, it came up as 0. I have well water so there shouldn’t have been any major changes done by the city or anything that could affect my water. Nitrites came up as 0 (in my tap water and in my tank).
To clarify, do you mean you have 0ppm nitrite now or a while back or whenever?
 
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CoconutTheBetta

Alright, so I’ve had my API test kit for a few months, worked great in the beginning. However, I am now having issues. Basically I wanted to test the water on one of my 6 gallon tanks, I only tested nitrates. My nitrate results came up as 80ppm and, naturally, I panicked and did a 75% water change. I refilled and afterwards I got the same results, 80ppm. I waited until the next day and did a 50% water change and got the same results. I followed the directions exactly (shaking the second bottle for 30 seconds plus, as well as shaking the test tube for a whole minute plus and I waited the 5 minutes to read). I am puzzled by this issue, is my test faulty? Did it go bad? I did use test strips (the runbo ones) and I don’t think they’re as accurate but they never showed my nitrates to be that high in the first place, and the numbers decreased after my two water changes.
I agree with what's been previously said, test your tap water and for nitrites. But is there a possibility that the test kit reached beyond the expiration date? It should be on the bottle. Has the test kit been stored in a place with bizarre temperatures or a fluctuation of temperatures?
Most importantly, have your fish been acting bizzare? With a reading as high as that, if your fish are acting normal then it's a faulty test.
 
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mattgirl

Are you adding liquid ferts to this tank? I know the first time I ran my nitrate test after adding the recommended amount of Thrive I was shocked at the number. I have to think that is why the instructions recommend changing out 50% of the water each week. Thrive C doesn't raise them as much but still do.
 
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