Getting rid of duckweed

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Aquarium Advice Apprentice
Mar 12, 2022
I have 2 tanks with duckweed in it by accident. Long story short I ordered red root floaters from H2O plants about 8 months ago and was new to floating plants in general. The floating plants they sent looked different from the pictures but I assumed they were just baby red root floaters. After couple months of them rapidly producing more and not getting bigger or looking like red root floater pictures online I figured out they were actually duckweed. Now over the course of those 6ish months I have very carefully and thoroughly picked what I thought to be every last duckweed out of both tanks multiple times and they keep coming back. Is there anything to do to get rid of them completely without tearing tanks down or will I just have to keep picking them out and hoping for the best?
Both are pretty heavily planted tanks
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