Growing duckweed ( Lemna minor ) in the aquarium. - The Planted Tank Forum
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post #1 of 12 (permalink) Old 06-12-2006, 11:15 AM Thread Starter
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Growing duckweed ( Lemna minor ) in the aquarium.

I have had a recient desire to grow duckweed. Now I have read that some people will have their tank covered with it in less then a week. But not me. It seems I stuggle just to keep a few leafs alive.

I believe the species I have is Lemna Minor, that is to say 'common duckweed'. I have a few problems questions as it many of them seem unanswered in my searches.

Firstly my duckweed seems to get pushed around by my filter. It gets knocked under water, and sucked up the filter in-take. What do you do about that? Right now I have a small floating plastic ring, made from the top of a plastic cup, to corral the duckweed untill further growth occurs.

Another thing is, I have a low-light tank. I figured the duckweed would do better if it was closer to the light, so I try to keep the water full up to the brim. Is this a good idea?


Last edited by crayfish; 06-12-2006 at 12:01 PM. Reason: To make post fitting for this forum
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post #2 of 12 (permalink) Old 06-12-2006, 12:51 PM
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If the filter is blowing it around and it's low light I've never had luck with duck weed.
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post #3 of 12 (permalink) Old 06-12-2006, 07:31 PM
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It seems that duckweed does best in tanks with no surface flow or low surface flow only. If you have the option of reducing the surface flow you could try that.

EHEIM 2213 #317
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post #4 of 12 (permalink) Old 06-13-2006, 02:39 AM
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My filter blows mine around in my low light tank and a lot of it gets stuck underwater, but it still grows like mad?
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post #5 of 12 (permalink) Old 06-13-2006, 04:58 AM
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I hardly think one or two inches between a low water level and a high water level are going to make a differnece in lighting intensity as far as duckweed is concerned.

In no aquariums for a while.....
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post #6 of 12 (permalink) Old 06-13-2006, 11:41 AM
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I have a tank with a HOB that blows the duckweed around like crazy and it still grows like mad. I have less than 2 wpg...

  • 20g planted
  • 20g & 29g fw fish only
  • 10g Hex planted
  • 55g planted
  • 65g SW Macroalgae & Fish
  • 175g FW
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post #7 of 12 (permalink) Old 06-14-2006, 04:03 AM
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I adjust the output of my canister filter to just give my duckweed a little movement. It grows like mad too. I just dose Watsons ferts useing the EI method and have 130 watts on a 29. I throw about a large table spoon of it away every week.
If anybody wants some. I'll send it just for the shipping of maybe $5.00

10 gallon hospital tank.
29 & 50 gallon - High Tech C02 enriched.
50 gallon Pond - Natural.
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post #8 of 12 (permalink) Old 06-14-2006, 10:14 AM
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i have 2 emperor 400s on my 55g and they grow fine. (Maybe cuz i have 220w of lights of them?). IMO they really are a WEED! Ive tried to get rid of it for months, yet it overtakes my tank within a few days. I wish I never got them in the first place lol
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post #9 of 12 (permalink) Old 06-15-2006, 08:24 PM
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That's like looking for a pet cockaroach... once you get one....

I can't get rid of mine... its everywhere- its on all the tanks - its all over the house as a matter of fact- it clings to your hands and skin and tools and then it gets everywhere. I have found it in my kitchen cabinets, in my underwear drawer, I've even come to work with a little piece stuck in my hair....
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post #10 of 12 (permalink) Old 06-16-2006, 01:26 AM
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Wow, sounds like the sand problem living on the Gulf Coast.

Turbosaurus has a point...some folks absolutely hate this stuff. Others kill it immediately and can never get it to grow. Then there are those who seem to have made their peace with it. Regardless, it is a personal choice and crayfish seems to want to know how to grow it. Crayfish, do you have any critters in your tank that might be eating it? Some fish do seem to love it...

EHEIM 2213 #317
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post #11 of 12 (permalink) Old 06-16-2006, 01:38 AM
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doesnt this tend to cut the light to the rest of your plants, being its a topwater plant or am I missing something?
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post #12 of 12 (permalink) Old 06-16-2006, 04:40 PM
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yup, you gotta take a bunch out every once in a while or itll choke out the top
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