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Re: [APD] Aquatic-Plants Digest, Vol 32, Issue 11
> Message: 1
> Date: Sun, 9 Apr 2006 11:56:32 -0700 (PDT)
> From: Thomas Barr <tcbiii at yahoo_com>
> Subject: Re: [APD] Aquatic-Plants Digest, Vol 32, Issue 10
> To: aquatic-plants at actwin_com
> > This approach is easier for me than the 3 or 5 day blackout.
> > Under either approach, having proper nutrients available in
> > the water column
> > is essential, or the BGA will come back.
> > Good luck.
> > Bill
> And what might that nutrient be?
> Add KNO3. This is ***the key piece of advice*** folks need to
> say if they want to help folks solve their algae related issues.
> This applies to Marine, Non CO2, CO2, excel enriched planted
> tanks. Both blackouts or antibiotics, specifically Eyrthomycin,
> work well and in about the same time frame.
> The after effect of the antibiotics last longer(about 1-2
> months) so if you do not correct the orginal cause, low NO3, the
> blackout will appear less successful, but if you address the
> cause, it's always been successful when followed correctly.
> Either way, adding KNO3 thereafter/during treatmnent will
> improve plant health/growth and reduce the likelyhood of
> That is the key part no one figured out and there are at least
> one site claiming ratios etc will solve BGA out there too,
> again, correlative issues do not imply causation anmd often do
> not even show strong support. I know that cannot possibly be
> correct because I've tried ratios of all sorts and it has little
> impact on plant/algae growth until, they become limiting and
> every single nutrients will become limiting for the plants over
> the long term first. The support paper noted also is not a good
> applicable reference. There also seems to be a good deal of
> confusion as to what the Redfield ratio is as well, It is an
> ATOMIC RATIO, not Mass Ratio. Mass wise, the RR comes to about
> 7:1 N:P, which is about what I suggest and macrophyte ratios are
> about 5-7:1, which is about the range I suggest(note, that's not
> NO3, PO4, that's N and P and we seldom address the N and P from
> fish waste, plant leeching etc).
> Tom Barr
> www.BarrReport.com Next month's article: Iron and Manganese role
> in aquatic macrophytes
Thanks for the advice, Tom. I think the terrestrials are eating up all of the N
b/c I have been adding quite a bit to try to keep the BGA at bay. I'll keep it
up, tho. And, once the terrestrials (ivys) are rooted, I'll take 'em out.
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