Duckweed, grows like crazy you just have to run a net around the tank every
so often
then dump the contents on the compost heap.

Duckweed grows a little *too* well. It might become a horrible pest.

I like water sprite for a floating plant. It's much easier to control than
duckweed, Salvinia, or frogbit.


Leigh

http://www.fortunecity.com/lavender/halloween/881/