What ever you do. Do not use Copper Sulfate. Which many folks do. And, it does work.
It is a heavy metal. And once introduced, into the eco system, of your tank
it will NEVER go away. And will, be in your fish, and anything else, that is in your
For the Cattails, I use some stuff called "Shore Clear". I can't remember the name of the company
I got it from. But you can Google it. They use only organic methods. It takes some work.
But it's worth it...
Here is a pic of mine. And I used only organic methods.