- May 15, 2014
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The tilapia will eat the duckweed in a matter of minutes, even as babies, to the point where there is nothing left. The minnows can fertilize (naturally/cleanly) the duckweed without eating it.
That's not entirely accurate. It depends on the size of the setup and the number of tilapia, of course, but I've definitely seen tilapia setups that have duckweed growing in them.