api liquid nitrite test question - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 12 Old 04-26-2011, 02:38 AM
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Originally Posted by Byron View Post
My API nitrite test kit is an old one [don't use it any more] but the instructions said to leave the regent in the tube for 5 minutes before comparing the colour. That may have changed...
+one, There is a right way and a wrong way to perform the test's.
Leaving solution set too long,not leaving solution set long enough,not begginning with enough water for sample, or too much water, can all result in inaccurate readings,confusion.
Best to follow directions exactly as written.

The most important medication in your fish medicine cabinet is.. Clean water.
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post #12 of 12 Old 11-02-2011, 06:33 AM
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i believe OP was doing the test correctly.

the Nitrites were simply well beyond what people normally get during their "off the chart" nitrite spike.

had same thing happen to me this week...test went from dark purple immediately, to clear blue after 5 minutes. For the previous 4 weeks it had been dark purple after 5 minutes (i had low pH so cycling was probably stalled...now rectified)

A friend added pure ammonia for me whilst i was away, when i got back i had the same thing as the OP...i guess my friend put in too much ammonia creating a truckload of nitrites.
Did 2nd test...same thing happened again: purple->blue

the following day the nitrites were back to a permanent dark purple after 5 mins. I presume they had decreased (since i didnt add more ammonia that day).

now done 2x 95% water changes, and finally got nitrites to 0.25ppm...will add smaller amount of ammonia from here on in.

yes its an old thread...just wanted to add my experience, as there seems to only be a few people who have seen the same problem.
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