09-11-2011, 11:45 AM
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Duckweed is ideal in "pond" or flooded forest aquascapes, and better in smaller (10g, 20g, 30g) tanks than larger (4+ feet). I find it especially useful as a second floating plant mixed in with Water Sprite, Amazon Frogbit, Brazilian Pennywort.
Like all floating plants, it assimilates a lot of nutrients from the water, including ammonium [this is why your nitrates are lower, the ammonia is being utilized up front so there is far less nitrite and thus minimal nitrate] because it has the advantage of assimilating CO2 directly from the air rather than the more laborious process from water like submersed plants, and the light is obviously brightest at the surface.
It is not difficult to keep in check; growth will fluctuate due to seasonal factors, and regular (weekly) removal of some of it will keep it where you want it.