Quick "corrections"...

1) I tried to keep Algae as plant, and BGA as "plant"
separate. They are different, BGA is a bacteria and not a
true plant. Unfortunately, in the mix-ed metaphor, where
you can treat BGA as if it were a plant, it isn't always
clear I was aware of the difference. I am. Thanks Sandy.

2) On the issue of "something runs out". Well, predation
and dis-infection would qualify as growth enabling defined
as a "lack" thereof. I'm sure BGA is happiest and most
prolific when any of its biologic predators, go lacking.
Biocidal chemicals, such as Chlorine, would also serve the
role of biologic predation.

2a) To the point of BGA, and "lacking" of a item enabling
growth... BGA is a bane to salt/reef tanks, too. There,
high-redox is associated with BGA limitation. Thus, in some
circles, a "lacking" of redox potential may be considered
enabling. Or, redox may just be an early symptom of the
onset of useful concentrations of some nutrient, perhaps DOC.

Even so, even on the reef side, severe limitation of P is
considered the definitive means of control for, um, cellular
plagues.

***************************************
Bill Kirkpatrick wrote:
wrote:

Eh? Life is a constructive process. It frankly doesn't care if, or
when, "something runs out" if it has no biological use for that
particular "something". Thus, BGA, or anything else, simply cannot grow
for LACK of a required component.