Duckweed problem

[guppycory]

I have separated duckweeds all over my aquarium. How do i keep them all together in certain area?

 

[Rivercats]

I used a small feeding ring which worked pretty good.

 

[MC1973]

That's a good idea river cats, but my guess is that the OP will get more.

I used to keep my duckweed in floating breeder boxes.

You could also try partitioning off some water at the top kind of like they do with the lanes at a swimming pool.