[APD] RE: Why algae does not grow

["Bill D" <billinet at comcast_net>]

"TB: "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."

Perhaps I am being obtuse, but I am still confused by those "chemicals."
Does "chemicals signal new growth"
mean that when there is new growth chemicals are released, or does it mean
that those chemicals (from somewhere) tell the algae to grow?

If the latter interpretation is correct, where do those chemicals originate
and can their control be another way to fight algae?

Thanks.

Bill


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