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  • yellow pogostemon helferi

    hi!

    just a quick question.

    Since the discussion: low light is better!! started, I joined the crowd and lowered my lights as well to 100 umol directly at the surface (and 50 umol at the substrate)
    However, the plants became very green. therefore I included twice a day a light peak of one hour (250 umol at the surface). plants have now a very nice colour. (happy)

    The problem is that I also cut back on the traces both iron and TMG, which resulted in yellow new growth of blyxa japonica and pogostemon helferi when dosed 5 ml TMG per day in my 90 gallon tank (which was very lean, I know)
    the addition of 7.5 ml flourish iron (0.2 mg Fe/l/day) fixed the blyxa within a week. however, the helferi remained yellow (both the leave and the veins).
    Then I increased 3 days ago the TMG dosis to 7.5 ml per day. no result yet...

    So: it must be an iron or trace deficiency. but which? what would be your thoughts?
    and if I don't see improvement the next couple of days, what would you do?

    greets,

    yme

  • #2
    Pogostemon helferi is prown to color white(ish) when there is an iron deficiency.. Maybe you can try to dose your iron directly on the pogostemon (using a seringe) to see if that is the case?

    p.s. So lowering the lights + 1 hour peak worked for you in regards of plant colors (e.g. reddishness or what?)

    Comment


    • #3
      Why don't just double the traces and Fe so you can rule them out?
      How much macros do you dose?

      Comment


      • #4
        . So lowering the lights + 1 hour peak worked for you in regards of plant colors (e.g. reddishness or what?)
        2x 1 hour peak
        yup, just the colour of the plants. instead of plain green, they now have a nice orange colour etc.

        Pogostemon helferi is prown to color white(ish)
        I know . but they are not whitish. just yellow/very light green. and in contrast to what you see on the www: the veins are also yellow/light green.

        Why don't just double the traces and Fe so you can rule them out?
        I am a bit scared for OD-ing traces. but I could give it a try... (low light, not much traces necessary)

        How much macros do you dose?
        NO3: 30 mg/l (1 mg/l/day)
        PO4: 1 mg/l (0,3 mg/l/day)
        K: 20-30 mg/l (measured)
        Ca: 30 mg/l (calculated)
        Mg: 6 mg/l (calculated)

        thanks!

        yme

        Comment


        • #5
          Hi yme,
          I'm confused. Does this mean you are only dosing 1/16 tsp KNO3/day?
          Originally posted by yme;
          NO3: 30 mg/l (1 mg/l/day)
          PO4: 1 mg/l (0,3 mg/l/day)
          FWIW, even though EI doses were determined using high light with good CO2, I do not understand why the drop off in plant growth requirements would be that great as long as you are adding CO2.

          <edit>
          I have always admired your "smarts" when it comes to this hobby. I have to wonder if you are over thinking this. I add 5ppm NO3 and 1ppm PO4 daily and have not had any problems to speak of. i am not familiar with their product but TMG doses of 7.5 ml per day also seams low. Please feel free to straiten me out.
          I am a bit scared for OD-ing traces.
          Last edited by Tug; 01-03-2011, 02:29 PM.
          :encouragement: Roll You're Own: Greater Washington Aquatic Plant Association
          Mixed with a sound of water's murmuring
          a sensitive plant in a garden growing.

          Comment


          • #6
            I'm confused. Does this mean you are only dosing 1/16 tsp KNO3/day?
            the concentration of NO3 in the tank is around 30 mg/l. (using a reference solution)
            calculating teaspoons to mg/l... (ah... Wet's EI calculator is great!!!)
            according to the calculator I add a little bit less than 2/16 tsp per 90 gallon per day in order to increase the NO3 level by 1 ppm.

            And since I don't have many fish (just a 5 flagfish that I don't feed, a SAE and some oto's) the NO3 consumption is rather low. which was also more or less the reason why I used less traces in the first place.

            greets,

            yme

            Comment


            • #7
              I wonder were the extra nitrate is coming from then?

              You can always try dosing something closer to the recommended EI. If that helps after a few weeks, slowly reduce the levels until you see a change in the plants.

              Short film about a man with an irrational fear.
              :encouragement: Roll You're Own: Greater Washington Aquatic Plant Association
              Mixed with a sound of water's murmuring
              a sensitive plant in a garden growing.

              Comment


              • #8
                I wonder were the extra nitrate is coming from then?
                owh sorry.... I now see the problem!

                after the weekly 50% water change, I add all the macro's back to the desired level.

                greets,

                yme

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