It's like a step above reef keeping, in some ways. They require special tanks without corners to keep them circulating away from surfaces, with a fairly calm, laminar boundary. They'll typically rotate the flow around the tank and jellyfish swim against it, keeping them "suspended". Beyond that and normal saltwater chemistry, there is the food. They require food pretty much every day. I would grow, enrich, and freeze of brine shrimp that I would partition out. Water changes would happen every week or two, I didn't want my nitrates above 15 ppm or so. Vacations were hard as they required a lot of attention. Nettles are way more voratious predators, so I'd sometimes feed them twice a day with protein-heavy options. Only got stung once by these guys, and it was because some nematocysts must have gotten on a sponge when cleaning and I wrung it out. Wasn't too bad.
It's a matter of mechanical removal - what you call 'scooping' - or introducing a herbivore to control the plants multiplication by vegetative propagation. Mechanical removal is actually great for exporting nasties from the aquarium water, though.
They tag a post so its general type can be easily determined. The badges I added are "Help" for threads seeking general advice or asking questions, "Public Aquariums", for posts related to aquariums seen in public places, whether a fish tank in a restaurant or an institution like the Monterey Bay Aquarium, and "Show & Tell", for threads showing something off.
I introduced it to two of my tanks and of course it took over, on one I used a headlice comb to sweep them all up, it was a bit annoying but it works and much better than netting as often recommended.
On the second tank I added florida flagfish which eat the roots and upped the flow, this has led to a real decline and it's now a nice addition to that tank rather than a nuisance.
Just keep scooping. And scooping. And scooping. Eventually, you'll get to the point where you're picking individual duckweeds out with your fingers. It's labor-intensive.
The only other thing I can think of is having high flow, which duckweed is supposed to dislike. You could potentially kill it off and let the critters in the tank eat it.
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