If a waterfall is your main source of oxygenation, then night is when the plants use
oxygen and if there is green water, lots of algae, that is when the plants can use up
all the oxygen if the water is really warm, then the fish will die.
Ingrid
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Somewhere between zone 5 and 6 tucked along the shore of Lake Michigan
on the council grounds of the Fox, Mascouten, Potawatomi, and Winnebago