Duckweed

jjohnwm

Redtail Catfish
MFK Member
Mar 29, 2019
2,023
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Manitoba, Canada
Hate this stuff🤬. You think you have eradicated it from a tank only to find out you missed a tiny little piece and now there's a million.
It takes mere seconds to quickly scoop up 90% of it, and you are removing tons of locked in nitrates and other fish wastes when you do so. And a week or so later, you can do it again! I'd never want to completely eradicate it!

But, yeah, if for some reason you decide you want it all gone...well, good luck with that. :)
 

The Masked Shadow

Redtail Catfish
MFK Member
Jul 19, 2020
4,638
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Southern California (San Diego)
How could I have duckweed, but have enough light and nutrients for other plants?
My tank has 8 different Bacopa Carolinia stems that are flourishing, plus 6-10 Vallisneria Spiralis stems, which are currently melting, but spreading. Also a few Anubis and Java Fern.
In the future I'm also planning Pothos, but that could be a problem for later.
 
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Deadeye

Goliath Tigerfish
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Aug 31, 2020
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It’s pretty thin, light will penetrate through it. You can also remove lots to make room for extra light.
 
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jjohnwm

Redtail Catfish
MFK Member
Mar 29, 2019
2,023
4,769
154
Manitoba, Canada
How could I have duckweed, but have enough light and nutrients for other plants?
Well, obviously, if you allow the duckweed to cover the surface of the tank with a solid layer an inch thick, it will be a problem. So...don't do that.

Control the amount of duckweed the same as you would any other plant. Experiment to find the amount of duckweed cover that gives you the appearance you like, and which still allows for other plants to grow as well. This amount will depend upon your own personal taste as well as light levels, nutrient levels, requirements of the other plants, etc.

It's always a compromise; shades of grey rather than simple black and white.

Edited to add: <<sigh>> Well...I guess it was Deadeye Deadeye 's turn to out-type me this time...
 
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The Masked Shadow

Redtail Catfish
MFK Member
Jul 19, 2020
4,638
4,783
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Southern California (San Diego)
pretty much all my fish eat my fish food (I think I keep most of the fish you do), which has duckweed in it. Mine consists of: Thin val, Watercress, duckweed, barramundi fillets, prawn and agar gel
Do your bichirs? Agar agar is safe for fish?
 

FJB

Redtail Catfish
MFK Member
Dec 15, 2017
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Philadelphia, PA
I have mixed duckweed with batches of Repashy. All my fish eat it, but among the ones who relish it, Flagtail Prochilodus, SDs (Metynnis), Bosemani rainbows, Ancistrus plecos, but really, all my fish.
 
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