Ah, perhaps I'll grow some out in an aquarium and do a transfer in hopes of a decent batch thriving.Goldfish will eat every duckweed plant you give them. At least, that was my experience. Before I knew that, I added it in hopes that it would multiply and help cover the surface, but they ate it all.
I live on the Mississippi River. In mid to late summer we have duckweed by the ton growing wild. The goldfish love it, but the wild stuff might have unwanted critters in it. I found two adult size zebra mussels and a host of snails. I killed the zebra mussels, but the fish ate the snails along with the duckweed.
I have been reading about oxygenators. I don't have to worry about runoff contaminating a marsh or anything of that sort, so I am going to get some foxtail from the river backwaters. I think I have about 1/2" of gook on the bottom to root into. I'll tie bunches together with mono and a lead sinker. I have ledges about 14", 30" and 48" total depth. Perhaps I should start with bunches laying on the 30' ledge? I can also get gobs of duckweed that the goldfish seem to love to eat. Should I worry about putting the foxtail in dirt?
use some rocks gravel to cover there roots , dont think dirct is necessary but if it fails then u can have them in pot .