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Ca and BG algea

Hi all,
  This is a new one on me, elvated Ca levels being condusive to BG algea
out breaks.  I would be interested in why Ca would have that effect.  I
did not realize that non calcerous(sp?) algea (or bacteria) needed large
amounts of Ca.


> Date: Wed, 01 Oct 1997 10:21:34 +0700
> From: Jim Kostich <jkos at execpc_com>
> Subject: Re:  Blue-green algae problem
> I've used erythromycin to treat blue-green algae (Cyanobacteria) outbreaks
> in both freshwater and saltwater.  In the short term, it works fine, killing
> the algae without appearing to affect the biological filtration, fish or
> plants.  But in the long term, it seemed to be of little benefit: the algae
> returned quickly, fueled in part by its decomposing ancestors.  I've had the
> best success by focusing on the factors that seem to encourage cyanobacteria
> growth - excess organic waste (most often from overfeeding and overcrowding
> the fish) and higher than necessary calcium levels (GH>10).  
> jim