[Zapins]

I think it is quite rare to see wolffia in the aquarium, so you might count yourself lucky.

To get rid of it, simply keep netting it out. It will take a while, maybe a few weeks, but it will eventually be removed. This is the only surefire way to get rid of it that won't harm the rest of your plants.

 

[Zapins]

Why not tie down the other plants, so they aren't near the surface for a few days. Then just scoop out the wolffia?

Also, try not feeding the goldfish for a few days, they should get hungry and eat the plants.

 

[Zapins]

The UV bomb sounds fun ^^ like something out of the movie Blade.

Why not try sell some of it on the for sale section of the site? I'm sure someone would like some. A lot of people breed fish and Wollfia would be a great cover, or food for certain fish. Since it isn't too common I think people would probably buy it.

 

[Zapins]

I have a suspicion that duckweed can also set seeds and survive long periods of time being dried out. I had a 10 gallon tank with duckweed that I was using to breed killies and then I let the water completely evaporate and the plants die off. A year and a half later I filled it with water and the duckweed came back to life!

I'm not sure if wolffia does this as well though.

 

[Zapins]

Hehe, one man's curse is another man's blessing