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[APD] Re: why algae will not grow

Tom Barr said:

"Liz is correct.
The issue is one of inducement.
Chemicals signal new growth, these might be variations in CO2 for BBA, NH4
for green water and staghorn and maybe other species, build up of organic
matter and high light, low PO4 etc."

Just when I got it through my head that algae problems were cause by
nutrient imbalances and that the best way to avoid them was to have healthy
plants, along comes "algae growth inducing chemicals".

Where do these chemicals originate?  Are they produced by the higher plants
as a result of stress of some kind?  Or are they like many disease
organisms, always present and waiting for a trigger to get to a critical
mass?  Could a way of fighting algae be to eliminate those chemicals


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