What fish will eat duckweed? - The Planted Tank Forum
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post #1 of 14 (permalink) Old 09-28-2019, 04:28 PM Thread Starter
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What fish will eat duckweed?

After getting some dime-sized baby angels, I used a couple of sponges to dampen the flow from my HOB since they can't tolerate too much water agitation. Within a week, I had an outbreak of duckweed I didn't know I had. Appeared out of nowhere. Guess the surface agitation from the HOB had kept them from multiplying. But now....

I've heard mollies will eat duckweed. Will they, and not munch on other plants as well? If so, any particular varieties/species that are better than others? I like the colorful Gold Dust Mollies--which are supposedly a variety of P. sphenops. But the only local source is Petco, and I'm terrified of introducing any pathogens to my baby angels. Don't have a quarantine tank set up, but I could quarantine 2-3 in a 5 gal bucket with some plants for a month if I had to--and I could be assured they'd do their job of duckweed control to make it worth the hassle

I like the idea of having some livebearers with my angels as their fry will provide a study supply of live food for them. Already have a host of guppies, but they don't seem to have any appetite for duckweed, sadly.

Any suggestions/experience welcomed--thanks!
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post #2 of 14 (permalink) Old 09-28-2019, 06:07 PM
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I have actively fed it to larger goldfish and silver dollars, but can't think of anything to put in a planted tank that would eat that and not anything else. Hopefully someone knows of such a fish -I'd get some myself!

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post #3 of 14 (permalink) Old 09-28-2019, 06:13 PM
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American flagfish, pretty too. Also eats lots of algae types as well.

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post #4 of 14 (permalink) Old 09-28-2019, 09:35 PM Thread Starter
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American flagfish, pretty too. Also eats lots of algae types as well.

Thanks, @DaveKS. Do you have any experience keeping this fish with duckweed, and if it eats duckweed but not other plants?

I'd heard of it, but the info online is either vague or inconsistent: SeriouslyFish says it is a micropredator "although algae and other plant material is taken as well." Other sources say they eat softer stem plants, others don't. There is a cool video on youtube of them eating hair algae, but nothing about duckweed

Was hoping someone on here might have had personal experience with mollies eating duckweed (or not)
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post #5 of 14 (permalink) Old 09-28-2019, 11:00 PM
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I've had silver mollies and some gold sailfins that never touched it. Either that or it was growing far faster than they were eating it. The only fish I've seen actively eating it were goldfish. You don't know anyone with some chickens do you?
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post #6 of 14 (permalink) Old 09-29-2019, 01:49 AM
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When I had flagfish I didn’t have duckweed, in fact I have always avoided duckweed same as I avoid herpes. But I never had them bother plants, but they’ll even eat staghorn algae.

I was just going on what I read about them eating duckweed.
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post #7 of 14 (permalink) Old 09-29-2019, 11:02 AM
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Sigh, I wish I could grow duckweed... My mollies devour it.

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post #8 of 14 (permalink) Old 09-29-2019, 01:05 PM Thread Starter
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Quote:
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I've had silver mollies and some gold sailfins that never touched it. Either that or it was growing far faster than they were eating it. The only fish I've seen actively eating it were goldfish. You don't know anyone with some chickens do you?
I'd heard that about chickens. I'd gladly trade duckweed for some eggs LOL

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Sigh, I wish I could grow duckweed... My mollies devour it.
Nice to hear. What kind of mollies do you have?
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post #9 of 14 (permalink) Old 09-30-2019, 12:05 AM
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emperor tetra


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post #10 of 14 (permalink) Old 09-30-2019, 05:24 AM Thread Starter
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emperor tetra
Hadn't heard that they were herbivores. There are a couple of tetras called emperor tetra--are we talking about Nematobrycon palmeri?
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post #11 of 14 (permalink) Old 10-05-2019, 11:41 AM
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I'd heard that about chickens. I'd gladly trade duckweed for some eggs LOL







Nice to hear. What kind of mollies do you have?
Dalmation, gold dust, creamsicle, black, all the varieties from PetSmart


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post #12 of 14 (permalink) Old 10-10-2019, 02:18 AM
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I used to give my extra duckweed to a friend who has rainbowfish. He says they gobble it up.
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post #13 of 14 (permalink) Old 10-11-2019, 02:28 AM
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I have two pico utility tanks with Fluval skimmers, just to pull off duckweed for any plants I drop in there. Maybe I need a rainbowfish tank!
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post #14 of 14 (permalink) Old 10-12-2019, 08:29 PM
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Hadn't heard that they were herbivores. There are a couple of tetras called emperor tetra--are we talking about Nematobrycon palmeri?
Almost all fish are omnivores
(of course there are some exceptions).

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