11-23-2012, 12:45 PM
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I deliberately keep duckweed in my 10g, and at each weekly water change I just scoop out maybe half of it (using a small net). It does now and then appear in the other tanks, but I have never had problems as I just scoop out the few bits when I see them.
Not the best plant for shade though, because it is not dense. But better than nothing. For shade I would go with Water Sprite or Brazilian Pennywort.
As several mentioned, for herbivorous fish duckweed is perfect. It gets its common name from the fact that ducks will gobble it up. Very nutritious stuff.
And it is ideal for water quality in difficult tanks; this plant will usually survive and spread where other floating plants might struggle.