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Hard tapwater and iron deficiency

Discussion in 'Advanced Strategies and Fertilization' started by PatrikS, Jun 9, 2006.

  1. PatrikS

    PatrikS Prolific Poster

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    Hi,

    My first post here :)

    I think I experience iron deficiency symptoms in my low-tech tank (greenish nerves enclosing new pale-yellow leaf tissue), even though I dose 5 ml TMG twice a week plus 5 ml Flourish once a week, and still have the symptoms. My tank is just 27 litres (about 7 US gallons). The deficiency is very clear in h. polysperma. Even cabomba aquatica is very very bright-green. I can add that I dose a lot of KNO3 and KH2PO4.

    Here in Uppsala, Sweden we have very hard water, around dH 16, if that is relevant.

    /Patrik.
     
  2. quenton

    quenton Guru Class Expert

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    Re: Hard tapwater and iron deficiency

    Can you provide more information?
    - are you using EI?
    - are you injecting CO2 of any kind?
    - how often to you do water changes, and how much?
    - how much of the other nutrients are you dosing?
     
  3. PatrikS

    PatrikS Prolific Poster

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    Re: Hard tapwater and iron deficiency

    Allrigt, here it is in short:

    Tank: 27 liter
    Light: 11 w PC
    Dosing: KNO3 up to about 30 ppm, KH2PO4 around 3 ppm
    non CO2, just Seachem Excel, about 5 ml every day
    I try not to do waterchanges at all, I try to follow T. Barrs "non-CO2 method"

    /Patrik.
     
  4. Tom Barr

    Tom Barr Founder
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    Re: Hard tapwater and iron deficiency

    It's not low nutrients if those parameters are correct.

    I'd suggest a large 80% water change.

    Dose things back and see how it responds, it's a small tank and not really a non CO2 method since you are adding some carbon for the plants.

    It should not be too hard to change such a small tank.

    Regards,
    Tom Barr
     
  5. PatrikS

    PatrikS Prolific Poster

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    Re: Hard tapwater and iron deficiency

    Allright, I try with a waterchange. I was also thinking that it could be my high pH (around 7,5) that caused the iron supplement to become unavailable/less available to the plants. As I use Seachem Flourish that has iron in Fe2+ state (which should be very easy for the plants to take up) I tried googling on iron ph, and found this:

    "IRON OXIDATION

    The time required for uncomplexed ferrous iron to undergo oxidation to the ferric state is dependent on many factors, the dominant being: pH; temperature; dissolved oxygen level; and the presence of other soluble ions. The lower the pH and temperature the longer the time required for completion of the oxidation reaction. Increasing dissolved oxygen decreases the time required for oxidation. For example:

    At pH 7.0, 90% Fe+2 oxidation requires 1 hour at 21o C and
    10 hours at 5o C. At 21o C
    At pH 8.0, 90% Fe+2 oxidation occurs in 30 seconds,
    at pH 6.0 it requires 100 hours.
    The critical dissolved oxygen concentration is 2 mg/L. Below that ferrous iron oxidation occurs slowly."

    Source: http://2the4.net/iron.htm

    Could my iron deficiency be linked to high pH?
     
  6. Tom Barr

    Tom Barr Founder
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    Re: Hard tapwater and iron deficiency

    Well, Tropica Master Grow will last longer and is more appropriate for your pH.

    Flourish has a very weak chelator, TMG is about medium.

    Ideal for a pH of 7-7.5 or so.

    Regards,
    Tom Barr
     
  7. Skyfish

    Skyfish Prolific Poster

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    Re: Hard tapwater and iron deficiency

    Tom,

    Where does CSM+B stand then? Ph is 6.4 with co2.

    I also done extra Flourish Iron.

    Thanks.
     
  8. PatrikS

    PatrikS Prolific Poster

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    Re: Hard tapwater and iron deficiency

    Aha, so Tom, as long as I use TMG then I can forget about such things as pH and water hardness? Just dose TMG twice a week and be done with it?

    /Patrik.
     
  9. Tom Barr

    Tom Barr Founder
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    Re: Hard tapwater and iron deficiency

    Yes

    Regards,

    Tom Barr
     
  10. PatrikS

    PatrikS Prolific Poster

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    Re: Hard tapwater and iron deficiency

    Thank You, Tom! :)

    /Patrik.
     
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