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fighting duckweed

like most of you, i also battle my duckweed.  (it's incredible that some 
people would even think of buying this stuff!!!!).

for some reason, duckweed does not proliferate in some of my tanks but it 
covers the surface of others.  i suspect that there are chemical battles 
going on between different plant species, and some are able to thwart the 
duckweed or prevent it from covering the surface.  my latest experiments 
involve using lots of Pistia stratiotes (water lettuce) and Ceratopteris 
(water sprite) to choke the duckweed out of my tanks.  it's working as the 
duckweed is retreating.

tsuh yang chen, nyc