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  1. It took me some time to review my journals of...

    It took me some time to review my journals of that tank in the past 4+ years.

    I believed that C limitation was always there in the non-CO2 tank. But for the N limitation, here are some of the...
  2. So N is the main limiting factor in the non-CO2...

    So N is the main limiting factor in the non-CO2 tank?

    Unfortunately I did not see any plants getting redder while they were withering, but the broken leaves and stunt growth reminded me of C...
  3. IMO, the activity or oxidization of bacteria...

    IMO, the activity or oxidization of bacteria increases from the water to surface sediments and decreases rapidly with increasing depth in the sediments. That means the soil will not rapidly be...
  4. Very interesting. I postulated that soil in the...

    Very interesting. I postulated that soil in the tank, just like in the wetland, traps and then locks carbon, and that is the reason why we can grow plants with Walstad's method or soil for years. I...
  5. Actually I've tried another non-CO2 tank using...

    Actually I've tried another non-CO2 tank using both soil and driftwood years back. Most of the plants in that tank were splendid, however, the plants looked ordinary in the later tank set up with...
  6. Driftwood instead of soil as the non-CO2 methods.

    After growing aquatic plants for more than 4 years with Walstad's method, I tore down my tank and started another experiment since February, and this time with driftwood but not bottom soils. It is...
  7. Here are my two non-CO2 tanks with Walstad...

    Here are my two non-CO2 tanks with Walstad method:

    http://i39.photobucket.com/albums/e176/paludarium/My%20Tank%2001/2007101301.jpg
    ...
  8. Gould, Kevin, et al. Anthocyanins: Biosynthesis, Functions, and Applications. Springe

    Well, the article referred to cell cultures, the similar story/myth also occurred on allelopathy in the planted tanks.

    http://link.springer.com/content/pdf/10.1007%2F978-0-387-77335-3_5.pdf
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    When the fan blows the water surface, CO2...

    When the fan blows the water surface, CO2 evaporates faster. I came to this conclusion years back when I was still using pH controller in my hi-tech tank, I noticed that when I blew the water surface...
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    Many aquaristis in Taiwan have the same CO2...

    Many aquaristis in Taiwan have the same CO2 issues when they blow the water surface with the fans in summer seasons.
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    Sticky: Thanks Tom. Aside from algae, according to...

    Thanks Tom.

    Aside from algae, according to this study on three aquatic weeds, http://www.plantphysiol.org/content/58/6/761.full.pdf, Hydrilla and Ceratophyllum had CO2 compensation points of 44...
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    Sticky: Hi Tom, correct me if I am wrong. 1...

    Hi Tom,

    correct me if I am wrong.
    1 microliter ( μL ) per liter = 1 ppm, reference: http://www.engineeringtoolbox.com/ppm-d_1039.html
    right?

    So, the CO2 compensation points of 16 freshwater...
  13. Well, based on the observations that too much O2...

    Well, based on the observations that too much O2 is negatively correlated with the growth of the aquatic plants, so that siesta, reduced surface agitation or decreased water flow will improve the...
  14. Do oxygenation reduce the growth of aquatic plants?

    Hi,

    I know that some of the aquatic plants experts (in Germany) still believe that oxygenation or too much oxygen in water will reduce the growth of aquatic plants, maybe a study from Cooley et al...
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    Hi all, for your references, the following...

    Hi all,

    for your references, the following review articles are worth reading:

    1. Smith DR, Wang RS. Glutaraldehyde exposure and its occupational impact in the health care enviroment....
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    Hi all, I've done an experiment in my non-CO2...

    Hi all,

    I've done an experiment in my non-CO2 tank last year, keeping the temperature constantly at 33 C (91 F) for 18 weeks. I added 30 ml glutaraldehyde into the aquarium every day during the...
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    I found that my Pogostemon helferi always grew...

    I found that my Pogostemon helferi always grew better on diftwoods or backgrounds. Maybe we have to treat it like the anubias.

    Pogostemon helferi on the background, with Diana Walstad's mothods....
  18. Hi Tom, in the study "Nitrification and...

    Hi Tom,

    in the study "Nitrification and denitrification in the rhizosphre of the aquatic macrophyte Lobelia dortmanna", Nils Risgaard-Petersen and Kim Jensen found that O2 was released from the L....
  19. Hi Tom, both NH4 and NO3 have been bothering...

    Hi Tom,

    both NH4 and NO3 have been bothering me for a long time, not for the algae issue but the plants issue. In her article "Plants and biological filtration", Diana Walstad demonstrated a...
  20. Thanks Tom, the author also discussed that...

    Thanks Tom,

    the author also discussed that factors such as presence of NH4, temperature, light and carbon availability will also influence NRA. Well, the presence of NH4 is of my interest. An...
  21. Nitrate reductase activity in roots and shoots

    Hi,

    I don't know if it was discussed here before. Recently I read an article "Nitrate reductase activity in roots and shoots of aquatic macrophytes". To my surprise, the author found that root...
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    Hi Tom, thanks for the reply. In another...

    Hi Tom,

    thanks for the reply. In another thread you explained to us with this article http://wetlands.ifas.ufl.edu/publications/PDF-articles/96.pdf, which showed that rapid disappearance of NH4...
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    Filamentous algae and pH controller

    I just read an interesting article...
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    Do aquatic plants prefer ammonium

    OK, here is the article http://depot.knaw.nl/3383/1/21273.pdf cited by Diana Walstad to show that aquatic plants prefer ammonium. After reading the original research, I was confused with the...
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    Thanks for the reply, Tom. I also believe CO2...

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