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Re: Simazine and plants - question

Duckweed (Lemna sp.)  is a major pest in several of my tanks. I would like to
know if simazine could be used to kill the duckweed without harming hornwort,
anacharis, Java fern, and Valisneria ?
I would like confirmation from multiple sources on way or the other. 
The only other duckweed remedy I can think of is adding goldfish or large
barbs to eat it; and this is just simply not an option.
Any further information would be appreciated.