Killing Duckweed with guppies - The Planted Tank Forum
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post #1 of 20 (permalink) Old 07-27-2006, 10:36 PM Thread Starter
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Killing Duckweed with guppies

Here is the issue.

my ten gallon is infested with both duckwed and guppies.

I like the guppies, but now the duckweed so much. It covers the entire surfaces many plants thick, and entangles itself in the najas so it is impossible to kill. I have trapped the najas is a giant clump under a rock and the duckweed all floated to the top, but...

1. The duckweed cannot all be removed with your hands, as their is too much and it floats away and hides in my filter and..

2 If I use a net, the most retarded species of fish on the planet (guppies) swim into the net. As soon as the net hits the water I have between four and eight guppies in it immedeatly. It's a small net, and along with the jeuvenile fish, i've had 12 guppies cram into one net.

I thought seperating the najas from the duckweed would be hard, but how can I seperate the guppies from the net?

Does anyone have any suggestions on how to get duckweed out of a tank?
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post #2 of 20 (permalink) Old 07-27-2006, 11:48 PM
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You can try placing a paper towel on top of the water and remove it. The duckweed might stick to it but the fish won't.


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post #3 of 20 (permalink) Old 07-28-2006, 12:40 AM
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Shopvac!!! - hehe. It is very satisfying to see the duckweed just disappear, but don't put it TOO far in the water or the guppies will get a rough ride!


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post #4 of 20 (permalink) Old 07-28-2006, 12:42 AM
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maybe try to syfoon it out somehow?.... not too sure best of luck tho because ive heard its impossible to get rid of...
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post #5 of 20 (permalink) Old 07-28-2006, 01:26 AM
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I always just skim it off with a plastic cup. Every tank should have a plastic cup nearby. If you're careful, you can avoid catching guppies, or at least dump them back when you do. On the other hand, if the tank is infested with guppies, what's a few less? They'll make more after all.

I've never tried the paper towel method, but it might work. Oh, and Fish Newb is right, YOU WILL NEVER GET RID OF IT!
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post #6 of 20 (permalink) Old 07-28-2006, 01:39 AM
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Quote:
Originally Posted by Canoe2Can
I always just skim it off with a plastic cup. Every tank should have a plastic cup nearby. If you're careful, you can avoid catching guppies, or at least dump them back when you do. On the other hand, if the tank is infested with guppies, what's a few less? They'll make more after all.
Same here. I use a small plastic cup and let the water trickle into it slowly. You won't get all the duckweed at once, It will be an ongoing battle for a bit. Doing this every few days should all but eradicate the duckweed.
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post #7 of 20 (permalink) Old 07-28-2006, 02:38 AM
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For reasons I don't understand, I seem to have gotten rid of my duckweed. All I did is scoop it out with a big net, having a rectangular opening. I would keep just the metal frame of the net in the water and push the mat of duck weed to the end, where it would tumble into the net. Whe I got down to just small patches I always had to dump the curious guppies out before taking away the duckweed. I did this for several months. Today I realized I haven't seen any duckweed for at least a month. The water may be warmer now than ever before, but other than that, and reducing the light period from 10 hours to 8- hours I don't think I did anything differently.

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post #8 of 20 (permalink) Old 07-28-2006, 02:48 AM
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A net wroks great, every water change I just got as much as I could until I didnt have it anymore


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post #9 of 20 (permalink) Old 07-28-2006, 03:13 AM
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OR...you could borrow someone's goldfish! I keep it growing in other tanks and a tub just to feed it to my goldfish (two shubunkin, one fantail, & one juvenile ryunkin). Whatever duckweed I put in is gone by the next day.

However the dumb goldfish wouldn't eat the guppy fry I dumped in and now I have two half inch guppy babies sharing their tank. I ended up removing several other fry to the diamond tetra/angelfish abode for population control.
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post #10 of 20 (permalink) Old 07-28-2006, 07:42 PM
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I scooped out my duckweed to feed to my goldfish...then one day I overscooped and it was gone. Many months later, I moved a few tubes and I am infested with duckweed again. The goldfish are delighted.

Borrowing goldfish would work if it were a bigger tank, but there's a chance they'd eat fry. I think mine would. They tend to do what you don't want them to do. (10-gallon tank sized goldfish wouldn't be able to make any headway against the duckweed--an experiment I'm running right now in a QT tank.)
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post #11 of 20 (permalink) Old 07-28-2006, 11:07 PM
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Increase surface agitation and get a few silver dollars for a week or two. I got an infestation which filled the entire surface of my 125 gallon (that's a 6 footer) and the 4 three inch SD's took care of it all in about 2 weeks. The surface agitation also appears to slow their multiplication rate.

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post #12 of 20 (permalink) Old 07-28-2006, 11:08 PM
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Well I can tell you heat wont get rid of it...my tank is in the upper 80's because of the heatwave and its getting thicker than ever before.....right now Im trying to float riccia and salvinia minima to maybe outcompete it but it seems to be a futile battle.....i guess a small victory is better than no victory right?

if you really want to get rid of it completely you are gonna have some casualties for sure......but i would rather have guppies reproducing in my tanks than duckweed but i think they reproduce at about the same rate right?(kidding on that last comment)
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post #13 of 20 (permalink) Old 07-29-2006, 01:04 AM
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I'll second the Silver Dollar idea. 3 petco SD's picked a mess of duckweed out of some java moss I have floating in a breeder tank in just a few days.
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post #14 of 20 (permalink) Old 07-31-2006, 06:33 PM Thread Starter
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The hardest thing is that even when I seem to kill all the plants, they always came back. I blacked out my tank (Najas, java ferns and anubias never die even without a light ^.^) and the leaves on the duckweed just got smaller. I've cleaned off the surfaces before and it keeps coming back, I think the filter hides some of it. I'll have to try to put something in there that will eat it. Thanks ^^
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post #15 of 20 (permalink) Old 07-31-2006, 07:14 PM
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Quote:
Originally Posted by gbhil
I'll second the Silver Dollar idea. 3 petco SD's picked a mess of duckweed out of some java moss I have floating in a breeder tank in just a few days.

What did you do with them later?

In college....so no aquariums for a while.....
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