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Thread: NO3, test kits...and GDA and BGA

  1. #1
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    NO3, test kits...and GDA and BGA

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    Sorry for the lengthy post

    I've been getting hit by GDA (Green Dust Algae) consistently. All my plants have been growing well except for the slow growing ones like Anubias and Java Ferns which seem to be easily overwhelmed by the GDA.

    I have been using the EI method all along. As I did more reading online, I think my problem has been that my NO3 is too hard and my plant mass isn't enough. I've since added more plant mass but it's still more towards the ADA Zen look instead of the heavy plant mass Dutch look.

    So, I've decided to move towards the ADA method, where they try to control the NO3 down to almost 0 ppm.

    As a preface, my CO2 ppm is very high. Definitely not an issue. Plants are pearling like crazy and CO2 test kit is showing almost green/yellow.

    I've stopped dosing my Lushgro Aqua (it has N in it) and Calcium Nitrate. Now only dosing Micros, Potassium Sulphate (for K), Potassium Phosphate (for P), Magnesium Sulphate (probably unnecessary but I did anyway). I have Corals chips in the filter for Calcium.

    After about 3-4 weeks, I noticed that my NO3 has dropped from >25ppm down to between 10-25ppm per the test kit. Not down to 0 ppm.

    So I believe the NO3 is still not 0 ppm probably due to the fish food that I'm feeding. That's alright in my opinion and unavoidable. Also, my plants are still growing but definitely slowing down, which is what I expected. Also, my GDA has reduced significantly. Not completely gone but very little to the point where I only need to wipe my glass once a week, instead of having to wipe 2-3 times/week.

    Here's the strange thing. NO3 is still not 0 ppm but I have now been hit by BGA (Blue-Green Algae or Cynobacteria). Here's the part that I am confused. I thought BGA is usually a sign of zero nitrates. My test kit is still showing 10-25ppm but I have BGA now.

    I know my test kit is still valid (expire 2023) and I've tested our tap water twice where it's really 0 ppm, so I'm not doubting the test kit results.

    So, question is, can BGA appear with >0 ppm NO3?

    I'm wondering whether I should start dosing NO3 again.

    Anyone else has similar experience?
    Cheers
    Boon Yong

  2. #2
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    Re: NO3, test kits...and GDA and BGA

    This is an interesting post, i would like to know more about this topic too. I don't have test kit but facing similar issue, but i got it the other way round. I was facing BGA issue, and starts to increase my fert to a point that BGA under control, but GDA appears on my tank wall (still better problem than BGA to me). Only my slow growing plants like AR mini suffer quite a bit now, hope to balance it better. Recently routed my CO2 inline atomizer to after prefilter-before canister filter, with the hope to improve CO2 saturation....

  3. #3
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    Re: NO3, test kits...and GDA and BGA

    I think BGA can hit areas where there is poor circulation or when PO4 is zero. why would u want to go for zero N? Isn’t that a macro nutrient.?

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