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Fast growing is a relative term. In general, most low light plants grow slow. Most stem plants grow faster according to how bright your lght is. For stem plants, Hygrophila polysperma, some species of Myriophyllum, and hornwort grow relatively fast under lower light levels. Because polysperma adapts so easily, it has become illegal and is more difficult to find for sale. C02 will also make a difference with moderate light and to some extent with even low light.
 
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