That's what I was going to say. Parrot's feather, or Myriophyllum mattogrossense, (myrios=countless, phyllon=leaf), is a demanding plant requiring high light intensity, CO2 and regular fertilization. It comes from the Amazon area of Mato Grosso in Brazil and in Ecuador, and therefore prefers warmer water 24-28 degrees C, than other North American milfoil species. From Kasselmann's book, Aquatic Plants.
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