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Results 1 to 6 of 6
  1. Exclamation Nitrite Confusion


    0 Not allowed!
    I posted about this in my journal but thought I might get more people looking at it here.

    I thought my 50gal had finished fishless cycling yesterday. I'd started cycling on 10/03/14. Ammonia has been dropping to 0 in 24 hours consistently for a week or so now but the nitrites have me confused. Nitrites rose to 5ppm+ by 16/03/14 and then appeared to start dropping - between 2ppm and 5ppm on 19/03/14; 0.5-1ppm on 24/03/14 and it looked like they were at zero yesterday. Great, I thought, cycle complete.

    I'm not so sure now. I tested this morning in preparation for doing a full water change before heading off to get fish. Ammonia was 0 but when I added the drops for the nitrite test the water in the vial turned a pale purple before fading to blue (0) by the end of 5 minutes. I have not noticed it doing this before (although I admit I don't sit there and watch the vial for the full five minutes).

    An internet search suggests that this means that nitrites are off the chart and the test can't handle it... yikes! How did that happen? Nitrites had apparently risen and then fallen steadily as detailed above.

    Somewhere on the internet someone had suggested testing with twice the water. Tried that and got the same result (how much nitrite is in this tank!?)

    Tried testing with four times the water. Result - blue from start to finish. What's going on here? I'd used the nitrite test from my other test kit this time (I ended up with two test kits so have been using one for each tank) so thought maybe the other kit is bad.

    Tried testing the usual amount with the second test kit nitrite bottle. Still starts out purple and fades to blue. So it doesn't look like it's the test kit.

    Tap water tests blue at the start and then develops to somewhere between 0 and 0.25ppm (last time I tested it was 0 and stayed 0).

    What do you think is going on? I know you're not usually meant to do water changes during a fishless cycle but do you think I should do a change to try and get the nitrites down to a readable level (if they actually are off the charts)?
    50gal - planned community tank - cycling
    40gal - species tank - 18 tiger barbs

  2. #2

    Default


    0 Not allowed!
    I've never heard of a nitrite test kit doing that when the level is off the charts, but then again I have never had nitrites go over 5ppm

    You can confirm this by mixing some tank water with tap water (50/50) before testing to see

    How high of a ammonia level have you been using to cycle your tank ?
    If you take your time to do the research FIRST, you can successfully set-up and keep ANY type of aquarium with ease.
    "Not using a quarantine tank is like playing Russian roulette. Nobody wins the game, some people just get to play longer than others." - Anthony Calfo
    Fishless Cycle Cycling with Fish Marine Aquarium Info [URL="http://saltwater.aquaticcommunity.com/"]

  3. Default


    0 Not allowed!
    The 50/50 mix tested at 2-5ppm.

    I started with ammonia at 4ppm and have been dosing to 2ppm once it dropped to 0.
    50gal - planned community tank - cycling
    40gal - species tank - 18 tiger barbs

  4. #4

    Default


    0 Not allowed!
    Then I would guess your actual nitrite level is somewhere around 8 to 10ppm

    Keep a close eye on it for a few more days. If it doesn't drop, the you most likely have stalled your cycle. A 50% water change at that point would help
    If you take your time to do the research FIRST, you can successfully set-up and keep ANY type of aquarium with ease.
    "Not using a quarantine tank is like playing Russian roulette. Nobody wins the game, some people just get to play longer than others." - Anthony Calfo
    Fishless Cycle Cycling with Fish Marine Aquarium Info [URL="http://saltwater.aquaticcommunity.com/"]

  5. #5

    Join Date
    Jan 2009
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    Default


    1 Not allowed!
    What happens before or after the 5 minute mark doesn't count. If at 5 minutes the test reads 0ppm then you have 0ppm.
    When I go fishing I just place a sharp rock in the water and sit there waiting for all the dead fish to float to the top... Kingfisher
    Brutal honesty will be shown on this screen.
    I think my fish is adjusting well to the four gallon, He's laying on his side attempting to go to sleep on the bottom of the gravel.
    Tolerance is a great thing to have, so is the ability to shut up.

    I can explain it to you, but I can't understand it for you.


  6. #6

    Default


    0 Not allowed!
    Just to make sure the kit is ok - you could run a test on tap water and make sure that it does come to zero.

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