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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