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nutrient deficiency?

Discussion in 'Aquatic Plant Fertilization' started by osmar amaral, Aug 1, 2013.

  1. osmar amaral

    osmar amaral Junior Poster

    May 27, 2012
    Likes Received:
    Local Time:
    4:19 PM
    My tank is 300 liters, is illuminated by four lamps of 54 watts t5

    my daily dosage is:

    Monday: 3.7 grams of KNO3 + 1 gram of KCl + 715 mg of K2HPO4

    Tuesday: 2.3 grams of 13% Fe + 0.3 grams of micronutrients

    Wednesday: do not use anything

    Thursday: 1.8 grams of KNO3 + 0.5 grams of KCl + 360 mg of K2HPO4

    Friday: 1.2 grams of Fe 13%

    Sat: 1.8 grams 0.5 grams KNO3 + KCl + 360 mg K2HPO4

    Sunday: exchange 80% of water, then add, 2.3 grams of 13% Fe + 0.3 grams micronutrient

    16 grams of MgSO4 +

    20 grams of CaSO4 +

    The tap water is very poor in all

    I have no algae, I think my Co2 is ok, some more plants show signs of deficiencies.

    The young leaves of Lobelia Small form are white

    And some are brown Glossostigma, see photos:



    can someone help me please
  2. Tug

    Tug Lifetime Charter Member
    Lifetime Member

    Jan 5, 2009
    Likes Received:
    Local Time:
    4:19 PM
    It could be a nitrate or a CO2 deficiency.
    What I notice is the change throughout the week in dosing levels.
    Wouldn't it be easier to change the frequency rather then the level of the dose?
    What is wrong with the tap water?
    What is the 0.3 grams of micronutrient you are adding?

    If you think you have a nutrient deficiency other then CO2, EI floods the water column with fertilizers to the maximum levels. You start there. If signs of deficiency still persist after a few weeks you might be wrong and your CO2 is not sufficient. Fix, then adjust EI.

    One way to estimate CO2 would be to take a sample of your tank water, let it sit for a day and check it's pH. Then check the pH in the tank after the lights come on or just before. You would be looking for a 1-1.3 degree drop in your pH.

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