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I wonder, though, if it is possible that the Elodea was depleting some other nutrients, leaving an overall nutrient imbalance in the tank? 

I'm just a one-tank novice, but I do sometimes wonder if it's possible that getting rid of BBA might not be as straightforward as this post implies.

----- Original Message ----- 
  From: Thomas Barr<mailto:tcbiii at earthlink_net> 
  To: aquatic-plants at actwin_com<mailto:aquatic-plants at actwin_com> 
  Sent: Friday, July 02, 2004 8:55 AM
  Subject: [APD] RE: BBA

  >No matter how well the plants themselves are growing the BBA stays
  >ahead.  I am quite sure that there is no limiting factor to plant growth
  >other than light (around 3wpg).  Co2 is around 25-30ppm, Nitrates around
  >10-15ppm and phosphorus around .1-.5ppm

  >As an experiment last weekend (I got tired of pruning 500 grams of
  >elodea weekly) I pulled the entire mass of that plant out of the tank.
  >All of a sudden, I have no algae growth at all!  The other plants are
  >happy and growing well.
  >Why would removing a fast growing (nitrate sucking) plant from the tank
  >make the tank less hospitable to BBA?   Nitrates were added to the tank
  >previously (in the form of KNO3) to keep the elodea happy.
  >Any and all analysis welcomed :-)

  Your Elodea was likely using HCO3, this makes your CO2 readings appear
  higher than are since this influences KH. Also, is this tank DIY CO2?
  The CO2 needs to be this level all lighting peroid long and consistently
  during the course of the week, not just the first few days after a water
  change etc.
  You stay with the same pH target but if the KH drops, and you are not good
  about it's measurement, you can underestimate the CO2.

  Continous CO2 at 25-30ppm during the lighting peroid will stop the growth
  of BBA. You might want to say it does not, or think your CO2 measurement is
  correct,  but I've done many times and it does work each time I've done it.
  Many other folks can also attest to this and found this to be true.
  Carefully measure both KH and CO2 right before the lights go off.
  Is your CO2 less than 20ppm at any time during the course of a week at this
  You have very little PO4, are you adding it?
  If not, do so. 

  NO3/PO4 had no influences of growth of BBA from my past test. Plants would
  grow better, but the BBA still stayed from 0.0ppm to 30ppm of NO3 and
  0.0ppm of PO4 to 2.0ppm.

  Add some SAE's also. Trim off all that's there presently. Then make sure
  your CO2 is in fact correct.  

  Tom Barr

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