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Advice Please

Discussion in 'Are you new to aquatic plants? Start here' started by steve todd, Jan 7, 2018.

  1. steve todd

    steve todd Member

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    after reading a lot of topics and posting some I’m still confused
    Tank is 150g
    Use pressurised CO2 using the CO2Chart I have Between 25-30ppm
    Low light tank With only a few Anubias on driftwood
    I was dosing the seachem flourish range of products phosphorus. Potassium and nitrogen and trace at their reccomended dosage.
    What I would like to know is what is the dosage rate of NPK on this tank and how often
     
  2. Phishless

    Phishless Lifetime Member
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    This is just my opinion on NPK for mentioned tank.
    I would target the water column being a low-light tank.
    20ppm of NO3 @ all times.
    2ppm of PO4 @ all times.
    Add a little K to get to at least 5ppm.
    Test NO3 & PO4 occasionally (2 weeks) to see how it's holding up.
    Low plant load so no need to lard it on all week long.
    Test GH, don't forget about Ca and Mg?
    Water change days may need to be a macro dosing day.

    Hope this helps.
     
  3. VaughnH

    VaughnH Lifetime Charter Member
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    What lighting are you using? I know you believe you have low light, but how low? Anubias require very low light, and grow very slowly, so you don't need much NPK to have enough for them. What substrate are you using?
     
  4. steve todd

    steve todd Member

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    Hopefully I can answer your reply. Don’t use substrate anubais r on driftwood they r the only plant I have as for light I’m only using 3 LED Tubes on 75CM deep tank this is how I thought it was low light

    Cheers
    Thanks for replying
     
  5. Allwissend

    Allwissend Article Editor
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    The thing with most Anubias is that even if all they need is available their growth rate is slow because of their metabolism. What @Phishless suggested is a good place to start. I would add that if fish are present you will probably have enough NO3 and maybe PO4 for the plants. The frequency of your dosing depends on how often you change the water. If I had a similar aquarium, with no/low fish stock, I will start with a wc every month followed by a full dose of NPK and micros every week.
    That sounds like low light to me.
     
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  6. steve todd

    steve todd Member

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    Thank you for the advice Allwissend. I do have it stocked with a lot of discus. I do a 200l w\c every week
     
  7. steve todd

    steve todd Member

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    because i have only anubias is it worth while to keep pressurised CO2 going or can i switch to using seachem excel
     
  8. Allwissend

    Allwissend Article Editor
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    Hi Steve, as the aquarium is focused on discus fish and there are only anubias, I would approach things differently. I think with the heavy feeding discus require, NO3 will be well covered so none is necessary or maybe 1 time dose of 5-10mg/L every week after water change is likely enough. If you use remineralized RO water, there will be enough Mg and Ca for the plants. If not add at least 3mg/L Mg per week. The rest dose as already described. If the plants show signs of problems increase dosing.

    I would keep the CO2 going but not at 30mg/L, maybe 15 or 20mg/L. I think CO2 will create less problems than excel.
     
  9. steve todd

    steve todd Member

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    first of all thanks for all the help i use tap water
     
  10. steve todd

    steve todd Member

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    I’ve added too much nitrogen and now have 40 ppm after doing three 200l water changes the level has not gone down on my 670l tank is 40 ppm too high
     
  11. VaughnH

    VaughnH Lifetime Charter Member
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    My tank shows about 40 ppm on my nitrate test every time I test it. So far, no fish problems. I'm pretty sure nitrate isn't a problem up to around 100 ppm.
     
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  12. Allwissend

    Allwissend Article Editor
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    Pretty much depends on the fish species and fish age. Some young fish may not grow as large if nitrate levels are very high. Thing is 40mg/L is not that high and then you have the random effect of the test kit. Nitrate test kits are notoriously bad when it comes to quantification.
     
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  13. steve todd

    steve todd Member

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    Thanks guys
     
  14. Phishless

    Phishless Lifetime Member
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    Did you use one of the online calculators to determine the dose? I hope!
     
  15. steve todd

    steve todd Member

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    I’m using seachem flourish nitrogen I used their calculator
     
  16. steve todd

    steve todd Member

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    Without having or able to get a K test kit how do I know if or when I have 5ppm of potassium

    Cheers
     
    #16 steve todd, Jan 26, 2018
    Last edited: Jan 27, 2018
  17. Allwissend

    Allwissend Article Editor
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    Better to err on the side of caution here. Let's say the worst case scenario is your K levels will be under 5mg/L. So the target is to have 5 or above.

    Best way available for us to be sure there are 5 or above mg/L K in the water is to add 5 or more mg/L K to the water. For example 10mg/L KNO3 will add 6.1mg/L NO3 and 3.9mg/L K.

    Then the question is "how often ?". The answer is mostly influenced by water changes and plant uptake rate. From others with higher light aquariums, we can say that the demand for K should not be larger than 20-30mg/L per week. So adding 10mg/L K per week should be enough for the aquarium setup you describe.

    PS. The same rationale can be applied to all other fertilizers and skip test kits altogether.
     
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  18. steve todd

    steve todd Member

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  19. VaughnH

    VaughnH Lifetime Charter Member
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    And, that is why the EI dosing method works so well. We are fortunate that the level of nutrients that is harmful is so much higher than the levels we dose at, even with the EI method. If the "too much" levels were much lower than they are the EI method wouldn't work at all.
     
  20. steve todd

    steve todd Member

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    What is mg/L
     
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