09-11-2011, 10:56 PM
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I personally hate the stuff mostly cause its been a near two year battle getting it out of a koi / goldfish pond outside, and the duckweed is still winning no matters how much I think I got it. It comes back... In a tank though its a decent floating mess. and long as you don't mind it shading whats down below it shouldn't pose too many problems. Just net what you don't want up and toss it in the trash and you'll be good to go. It'll grow like a weed though generally.