Ahh, the joys of duckweed! its in all my tanks now, whether I wanted it or not. It does multipy so rapidly it's hard to believe.
2 things I've found it useful for:
1. Newly set-up plant tanks, it works as an algae buster. My theory is that it sucks up excess nutrients that the algae would feed on, so no (or at least less) algae problems. New tanks are by far the most vulnerable to very frustrating algae attacks.
2. I constantly have excess duckweed, clean it from tanks 2-3 times a week. Goldfish love to eat the stuff, throw the excess from tanks into my pond, the goldfish munch on it. the fact that some remains in the pond, but its not overloaded like my tanks, indicates to me that its a good veggie food for my goldfish!
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Since Wisteria requires little to no light (I've clipped some and put it in my Paludarium under 40 watts with massive success)
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I shall have to give it a try in one of my low-light tanks, good idea, Bearfan!