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Thread: High Nitrates

  1. #1

    Default High Nitrates

    0 Not allowed!
    I have not been able to keep my nitrates below 10-20 ppm and wonder what I can do if anything besides water changes? I have 10 guppies in 75 gallon tank and it is cycled with 0 ammonia reading. I have plenty of circulation and filters. I only have rock and few plants in there atm and am about to get 4 agazzi's today so need some help.

  2. #2

    Join Date
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    0 Not allowed!
    10-20ppm nitrates is still in the acceptable level, but seems high for a 75g with only 10 guppies. how long has the tank been set up and how often do you do water changes and how much each time? also have you checked your tap water for nitrates?
    People say if you can't say something nice then don't say anything at all... Then they wonder why am I so quiet.
    Everything happens for a reason. Sometimes that reason is you are stupid and make bad decisions.

    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.
    A moderator on a fish forum should be able to identify an oscar... Don't you think?

  3. #3


    0 Not allowed!
    I have a similar issue but I have more fish in my tank which is smaller than yours - along with answering the questions mommy1 asked, I would ask how often do you feed your fish and clean your filters? I used to feed my fish way too much and found lots of rotting food in my filter tubing contributing to higher nitrates. However, 10-20ppm is fine in general.

  4. Default

    0 Not allowed!
    Try cleaning out the filter (not the media). That's why my nitrates were high. The powerheads and what not were filled with sludge that would be spewed out after a water change. The fish liked to eat it for some reason...
    . .`.. ><((((>`..`..`...><((((>
    ><((((>`..`..`... ><((((>.
    `.. , . .`.. ><((((>`..`..`...><((((>

  5. Default

    0 Not allowed!
    10 to 20 isn't high. Check your tap water to be sure you don't have trates right from the sourse. Make sure you have an up to date test kit.

  6. #6


    0 Not allowed!
    Thanks for the help. I will check my tap water and feed food once a day and they eat it before it has a chance to hit the bottom. I do weekly water changes of 20 gallons and fish have been in there a week. I will check the filter media and clean it and see if that helps. Fish are healthy and have had one batch of babies already. Thanks again.

  7. #7


    0 Not allowed!
    Me, too, on the filter cleaning. Squeeze the crude out in tank water you are tossing. High nitrates plagued me for a short time until I started cleaning those filters more often.

  8. #8


    0 Not allowed!
    I tested the tap water from faucet and it has Nitrates so that was part of the problem but I tested tank water and after adding a few more plants it seems to be 5ppm-10ppm now so will just keep an eye on it. Thanks for the suggestion of testing the tap water.

  9. Default

    0 Not allowed!
    Now I suggest getting a water test from a water conditioning company.Nitrates in any amount are not good in your drinking water and can be indicitave of ground water contamination by local farmland.It can rise significantly during different times of the year. Not trying to alarm you,matter of fact,these hobby grade water tests are notorious for showing things that arent even there.Most of the water conditioning companys offer simple water tests for free and trates are usually included in the basic.

  10. #10


    0 Not allowed!
    Will do, thanks again.

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