I'd give frogbit a try. It's larger than duckweed and much easier to
control and needs much less light. I've tried water lettuce, duckweed
and frog bit and frog bit is by far my favorite. Especially if you let
their roots grow long into the tank and let the fish swim between the
long slightly furry roots. They seem to enjoy it and feel very
comfortable. Duckweed takes a lot more light than other floating
plants (IMHO), and I could never get it to take off well even with
220W of CFL lightning in a 72. Water lettuce grows very slowly and I
didn't like the look of it much. I don't know the lighting
requirements for water lettuce.

Best of luck.


"Donovan N" wrote in message . ..
Can anybody suggest an undemanding floating plant that I can add to my
aquarium to make the cardnial tetras feel a bit more secure?

Also, while I'm here... Any suggestions on a particular type of cory
that can be added to a six gallon tank? i.e. a species that stays small.

thanks for the input

--donovan