Hi,
I'm part way through cycling my first tank, (day 10 to be exact), and have been measuring Ammonia, Nitrite and Nitrate using a Nutrafin Master Test Kit (Liquid). So far I'm quite happy with the readings, but last night and again today whilst testing for nitrites something weird has happened.
To start with, from my reading around I would have expected ammonia to drop gradually, (which it didn't) and nitrite to drop quickly after being high for a while (which it isn't - it's declining slowly). Typical!
Anyway, I've been leaving the nitrite test to develop for two minutes each time, (as the instructions advise), it's just that last night and again this evening on the cusp of two minutes instead of remaining a light(ish) shade of pink it is going a [to put it nicely] urine yellow colour (similar to the colour indicative of high ammonia in the ammonia test.)
My question is, what the hell does that mean!?
If there are no nitrites surely it should go clear like the ammonia test does? Help! 
I'm part way through cycling my first tank, (day 10 to be exact), and have been measuring Ammonia, Nitrite and Nitrate using a Nutrafin Master Test Kit (Liquid). So far I'm quite happy with the readings, but last night and again today whilst testing for nitrites something weird has happened.
To start with, from my reading around I would have expected ammonia to drop gradually, (which it didn't) and nitrite to drop quickly after being high for a while (which it isn't - it's declining slowly). Typical!
Anyway, I've been leaving the nitrite test to develop for two minutes each time, (as the instructions advise), it's just that last night and again this evening on the cusp of two minutes instead of remaining a light(ish) shade of pink it is going a [to put it nicely] urine yellow colour (similar to the colour indicative of high ammonia in the ammonia test.)
My question is, what the hell does that mean!?
If there are no nitrites surely it should go clear like the ammonia test does? Help! 
As mentioned above I'd noticed that my nitrite test was doing something it wasn't supposed to be doing, which got me questioning the reliability of the other tests from the Nutrafin kit. As a result I purchased an API Master Test Kit this afternoon and re-tested across the board. My Ammonia instead of being 0ppm as the previous test was reading, was actually 8ppm, and my Nitrite 0ppm (I didn't know how to interpret that for the previous test anyway).
I've never used Nutrafin so I couldn't offer any advice or observations. I've always used the API test kit and I think it works great. Best of luck with cycling. Hopefully, the rest will be a breeze....
