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Need help with my EI dosing routine

Discussion in 'Aquatic Plant Fertilization' started by marti, Jan 19, 2010.

  1. marti

    marti Junior Poster

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    Hi,

    I have a problem related to macro dosing. But first let me tell you something about my tank:
    - tank is about 6 month old, it has the following dimensions (cm): 100x40x40
    - lights: 4 x 39 w (T5 fluorescent bulbs - Osram 865) about 10h/day;
    - CO2 about 2-3 bouble/second;
    - pH around 6.8.
    - temperature ~25 Celsius degrees.
    - fertilization with microelements is assured by JBL fert. system (substrate, daily and weekly liquid ferts);
    - list of the plants: micrantemum micranthemoides, anubias nana, limnophila aromatica, HC, blyxa japonica, pogostemon helferi, glossostiga elatinoides, micranthemum umbrosum.

    Now, let's get to the problem:

    for fertilization with macroelements I'm using an NPK in an estimated Index regime.
    The solution has the following characteristics: for each mll I add in my water I increase the concentration of macroelements with: 1ppm NO3, 0.1 ppm PO4 and 1.33 ppm K.
    For a few months now, I'm adding weekly 40 mll solution, in my calculations this addition stabilizes concentrations, over time, at these levels:
    - 52 ppm NO3 (at a presumed uptake of 28 ppm / week)
    - 78-79 ppm K (at an assumed uptake of 28 ppm / week)
    - 5,2-5,3 ppm PO4 (at a presumed uptake of 2.8 ppm / week).

    THe question(s):
    - are this calculations OK? If not, what is the mistake? what would be the correct weekly addition in order to maintain about 30 ppm of K and NO3 whilst PO4 is maintained around 4-5 PPM?
    - if my math is not wrong, and the values are correct, altough my fishes and my plants are OK, isn't wise to dim the concentration to about 30 ppm of K and NO3 whilst PO4 is maintained to this value (I have some GSA problems too)?
     
  2. Biollante

    Biollante Lifetime Charter Member
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    Lighting Masquerading As A CO2 Problem

    Hi,

    Directly it sounds like a CO2 problem more than anything else. If believed that I would gently raise the CO2 and/or make sure your circulation is adequate.;)

    In reality I think it is just plain too much light. I think the simple answer with the least fooling around would be to reduce the lighting. If it were me, I would cut the lighting in half. ;)

    Biollante
     
  3. marti

    marti Junior Poster

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    I don't understand the answer....if my thread is posted on a wrong section of the forum, I'm asking an admin to move the thread in a sectioin where it belongs. Thanx
     
    #3 marti, Jan 19, 2010
    Last edited by a moderator: Jan 19, 2010
  4. Biollante

    Biollante Lifetime Charter Member
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    Sorry If I Was Unclear

    Hi,

    I think your post is in as good of a place as any.:)

    My apologies for being unclear. :eek:

    I think your math is fine, never used JBL, do not know, do not really care, I think your fert routine sounds fine.:)

    Personally, based on my experience, I would have two choices. :)

    Choice one try to increase CO2 in solution, or improve the circulation to make sure it is appropriately distributed.;)

    Choice two decrease the lighting, I thought I was pretty clear, I would cut the lighting in half. Cutting the light is the cheapest and easiest route. ;)

    I think I know what you wanted to hear, but you asked, I answered, as honestly as I could, based on my experience. :gw

    Biollante
     
  5. marti

    marti Junior Poster

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    I got it now, but there's no need for you to appologize. :)
     
  6. Biollante

    Biollante Lifetime Charter Member
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    Hi,

    Sometimes I get ahead of myself. :eek:

    Also, mine is but one opinion based on my experience.:cool:

    Biollante
     
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