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Duckweed predator

>Try an environmentally freindly way of exterminating duckweed: put a small
>Giant Gouramy (Osphronemus gouramy) in your tank. They eat the stuff. In
>Indonesia duckweed is actually collected by some people who raise giant
>gouramy for food.

This sounds like trading a little problem for a big one.  What do you
intend to do with this very large fish when you are done feeding him the
duckweed?  Who wants a very large, extremely unattractive herbivorous fish
that will live for many years?  Is it fair to kill it off when you are done
with it?  Are you really willing to buy a several hundred gallon tank to
house it if you don't kill it?