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The following was quoted from the www.tropica.com website:

"Ceratophyllum demersum often forms monospecific populations 
and is found down to 10 m depth as individual very slow-growing 
plants. In the aquarium, on the other hand, it prefers relatively high 
light, and it does not tolerate transportation for extended periods. It 
excretes substances toxic to algae (allelopathic behaviour) and at 
good growth conditions it efficiently inhibits most algae growth. "

Does anyone know is this is really true?  Does anyone have any 
experience with this?