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Ammonia reading is.. orange?

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I tested the ammonia of my main tank after dosing it with plain ammonia last night, and my reading was.. orange? I have the API master kit, so this was baffling to me. I extra rinsed the test tubes, and used different ones: orange both times.

 

I fairly recently had PP in my tank to sterilize it and then oxidized out the remainder after a 50% WC with hydrogen peroxide. I let it sit with the filters on for several hours before dosing ammonia. I guess a big water change is in order? I was just wondering if anyone had ever seen this and what it might be.

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No picture? Positive it was the ammonia test bottles? Nitrate could be orange.

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Definitely ammonia. Double checked. It's freshly fishless cycling, too, so I doubt there are nitrates.

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Test your tap or another tank and see what you get.

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how old is the Ammonia kit which you used?

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Mystery kind of solved, I think: there must have been some residual PP or something in the main tank, because everything was back to normal today. I also used the ammonia drops on my QT to see if they were still working, and they do. The drops were only a few months old, so I was particularly confused. Thanks for the suggestions!

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Those test tubes can hold a surprising amount of residue in a ring in the bottom!

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Yeah, it was weird: the tubes were all clean. I think the tank itself needed more time before being tested. 

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