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You gotta tell us about your aquarium conditions---light level, substrate, water, what kind of fish and how many, what fertilizers, if any, you are using. It is hard to imagine conditions that kill Vallisneria in just a few weeks. Are your other plants doing OK? What other plants do you have? What variety of Vallisneria do you have? Can you give us a picture of your dying Vallisneria?
 

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If you have a well-established sword plant that is dominating the tank, it can be hard for any other plants to get started and grow except maybe java fern, which tolerates low light and low nutrients by slowing down its growth, but not dying. Vallisneria and Hygrophila polysperma do need some room, and some light, especially the Val. The old-fashioned big Amazon sword can dominate a tank, even when the light is pretty low, around 1 to 2 watts fluorescent per gallon. Still, it seems odd that the Val should die in two weeks.
 

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Consider keeping the sword and maybe growing some of the Java fern with it. Try the Val in another tank that could be better lit and could be a home for more light-loving stem plants. Why kick out the sword when it is doing its job so well---inhibiting algae and soaking up nutrients?
 
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