I will use my 25g for this.
I will have it barebottom(no gravel)
I will have a piece of styrofoam, or some sort of matriel that floats, and i will cut it to be able to float around, but not float around too much, it will have about a inch or two around the outside of it, so it will be able to float a bit.
Then i will have holes cut for the plants to fit into, there roots will be hanging in the water, while all of the foilage is sitting outside of the water.
There will be 2 big areator's providing oxygen to the roots.
I will also cover the back and sides of the aquarium, to be sure as little light gets to the roots as possible.(it would be smart to cover the front of it too, but then i wont be able to enjoy it as much...so ill take my chances)
As far as lighting goes, im not sure yet, but i will figure somthing out.
I will also be using the exsisting powerfilter.
As far as fish for the aquarium...what do you guys think?