RE: [AGA Member] Cyanobacteria and Redfield ratio

["Carlos Sanchez" <tsunamicarlos@hotmail.com>]

I had a cyanobacteria outbreak in my 55g while I was gone. Tests showed that 
the water had 3 ppm PO4 and 0 ppm NO3, so my observations match with both of 
yours.

However, I've also had cyanobacteria outbreaks due to 0 ppm PO4 and ~20 ppm 
NO3. It occurred in my 55g when I had 4 wpg over it (and knew nothing about 
PO4 at the time). I suspect that the plants were suffering from an extreme 
PO4 deficiency that lasted for a couple months.

Carlos

> From: "Daniel Larsson" <defdac@hotmail.com>
> Reply-To: aga-member@thekrib.com
> To: <aga-member@thekrib.com>
> Subject: [AGA Member] Cyanobacteria and Redfield ratio
> Date: Tue, 30 Mar 2004 10:36:47 +0200
>
> > Date: Mon, 29 Mar 2004 12:37:23 -0500
> > From: "Steve" <steve_wilsonii@fishpalace.org>
> > Subject: Re: [AGA Member] Bacterial algea?
> >
> > My experience has been such that my planted tanks
> > were always infested with BGA off and on. I would
> > constanly be adding erithromycin to kill it and it
> > would stay away for about a month. Test readings
> > showed slight traces of PO4 and no traces of  any
> > nitrogen source.
>
> This is my experience also. Too much PO4 in relation
> to NO3. The plants strips the NO3, which becomes
> limiting to the plants which stops the PO4-uptake
> and the Cyanobacteria have everything it need because
> it can use N2 (gas). Total domination.

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