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Duckweek and nitrogen fixation
I may be misremebering, but doesn't duckweed fix atmospheric nitrogen?
If so, it may cause some problems. I doubt, however, that an aquarium will
ever be nitrogen limited, so maybe there will be no problem at all.
I just remember a story about rice farmers taking Westerner advice and
eliminating duckweed from their paddies. The crop yields were then reduced
because of the lost nutrients that the duckweed provided.