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You will get a variety of views on green water. If it is opaque ... truly like pea soup, I think that is too risky, whether the pond is concrete or mud. Oxygen depletion is as serious a concern as the other factors you mention. However, a greenish shade is not as negative, in my opinion, as some others think. The unicellular algae are very efficient consumers of ammonia. Their presence forms a cushion against nitrogeneous wastes in the water, and in the process skin is protected from irritation and colors are enhanced as a result of not being exposed to nitrates. That said, forget any notion you might have of trying to cultivate green water. It is humanly impossible to create favorable conditions that are not at risk of getting out of control to the detriment of the fish. The one exception is the cultivation of green water in fry ponds for purposes of feeding the fry. It is larger fish that are most at risk. Fry thrive with the micro life to consume all around them.
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