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Something strange with Fe level

Discussion in 'General Plant Topics' started by borman, Jan 28, 2009.

  1. borman

    borman Prolific Poster

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    Hello

    I have very strange problem with the ferrum consumption and level in my tank

    Im adding ferrum daily to maintain 0.1mg/l level. ( I use hand made Fe solution produced from Fe2S04+EDTA+ascorbic acid. Its have good stability)
    Never test it before but seems that its was ok for al my plants

    this sunday im completely replant all my Glossa and on the next day catch huge chlorosys on young leaves. Also all my Sagitaria subulbata became yellowish.(Rotala Indica, Moss, Ludwigia feels good with no chlorosis symptoms)
    I check Fe level with JBL test - 0.. S I decided to add 0,2 mg at evening and 0,2 morning.. At evening i once again check test - 0. - Same thing on the next day +0,2 evening +0,2 at morning and at evening - level is 0. Also no visible improvement in plant state. Then I made test to check my solution. In simple untap water I add it to get 0,4 mg/l - stay it on night and in morning test it with JBL - 0,4 - So the solution is no reason.
    BUT what the reason - plants eats more then 0.4 fe dayly :eek:
    Or its another reason
    - may be UV lamp, with work 24/7,
    - may be something in canister filter (i did not clean it for 2 month),
    - may be hight K level (25mg/l)
    I also add NPK+Trace (all handmade) every day

    Please help
     
  2. Gerryd

    Gerryd Plant Guru Team
    Lifetime Member

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    Hi,

    Are you using c02 at all? What size tank is it? Type of substrate and lighting, duration, etc. How much of the macros/trace do you dose?

    Have your test kits been calibrated against a KNOWN reference solution for accuracy?
     
  3. Tom Barr

    Tom Barr Founder
    Staff Member Administrator

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    What is the KH (alkalinity) of your tap water/ aquarium water?
    Often times the ETDA is not a good chelator at higher KH's.

    also, you recently re did the aquarium and planted the plants, this takes time to readjust, dosing Fe alone is not going to resolve that.

    Testing for Fe is very problematic.
    I would not suggest that you do this.

    I often add trace elements based on volume of the solution and the aquarium's volume.

    This never changes, test kit errors and and chelation certainly do change.

    So I add say 20mls of trace mixture(Say Tropica or Seachem) for each 300 liters of aquarium 3x a week, maybe 4 x a week.

    This is plenty for any system and is "non limiting", no matter what the plant biomass, no matter what light you have, very high light etc.
    You can and may try dosing less, but this is the upper bound.

    Regards,
    Tom Barr
     
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