Zn, Mn, and Fe All way too high in hw-Marinemix Reefer Salt

Discussion in 'Reef Aquarium Discussion' started by Snookin, Nov 13, 2017.

  1. Snookin

    Snookin Well-Known Member

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    upload_2017-11-13_12-33-19.png
    Ok, here's the problem. I have a 20g food grade brute container to store premixed saltwater. My tank was Triton tested on 8/02 and I found elevated levels of Zn, Mn, and Fe. Everything else was in the green and good to go. So, I tested my water storage container on 8/15 and the results were all high. I thought it might be my old hydor pump or my RODI filters were too old (less than a year though) so I replaced the pump and all my rodi filters. TDS has always been 0.

    After replacing all these I just tested the storage container again and found the exact same results. All highly elevated Zn, Mn, Fe.

    All more corals look good though.

    Here's my questions:
    1. Are these elevated levels so bad I need do something now even if my tank looks good?
    2. Could the salt mix be the issue and has anyone else seen this with HW-Marinemix Reefer?

    What is going on?
    Thanks
     
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  2. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Expert Contributor Article Contributor

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    The values are surprisingly high. This test is of newly mixed seawater?

    What were the tank levels of these?

    They certainly seem to suggest corroding metal, such as a zinc coated piece of steel. No metal parts exposed to this new water? No internal metal parts in whatever mixing apparatus you use?

    It is possible a chunk of metal got into the salt mix from the factory.
     
  3. Snookin

    Snookin Well-Known Member

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    This test was premixed saltwater that was in brute container for about 1 week before testing. No metal parts in saltwater storage brute container.

    Here's a test I did an hour after water change on my tank: (This is a test of my reef tank)
    upload_2017-11-13_14-30-22.png


    Here's a test I did after a week before the water change: (Reef tank)
    upload_2017-11-13_14-31-28.png
    As you can see. The highest concentration of these elements is in my saltwater storage and over time my tank is absorbing these elements till my next water change when they are reintroduced.

    Let me know if that explanation doesn't make sense.

    Thanks
     
  4. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Expert Contributor Article Contributor

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    Well, the zinc and manganese can afford to be boosted, so that's not apparently a concern. :D

    Some folks (such as Gelnnf) add a ton of iron and Red Sea says the "optimal" level of iron is 150 ug/L, which you are way below in the tank (I personally do not recommend that much, but it must not be seriously problematic for most people).

    Consequently, I don't suggest you need to do anything at the moment. :)
     
  5. Snookin

    Snookin Well-Known Member

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    Ok. Sounds good Randy. Thanks for the advice.
     
  6. Snookin

    Snookin Well-Known Member

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    Ok. Sounds good Randy. Thanks for the advice.
     
  7. Snookin

    Snookin Well-Known Member

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    Ok. Sounds good. Thanks for the advice Randy.
     
  8. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Expert Contributor Article Contributor

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    You're welcome.

    Happy Reefing. :)
     
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