Water wisteria can be left floating.
My petsmart sells amazon sword, under amazon sword, it might just be a seasonal thing though? I havent looked for a few weeks.
Anubias is good but it has to be tied like your java does. I tie mine with thread around the rhizome, its really simple and works. You can also use fishing line, and I actually would have prefered doing that than thread as my thread has started to desolve before the roots attached themselves before.
Other good plants would be anarchis, money wort, java moss, bacopa, cabomba, hornwort, vallisneria, uhm, practically everything they sell at petstores is low light. My anarchis doesnt really do well with incandescent light though, if I were you I'd just run to walmart and get some CFL's for your tank, they are pretty cheep and much better for your plants IMO.
Oh and for your fern, I'd go ahead and tie that into the tank you plan to keep it in permanently. You can move it to another tank if you want but it doesnt really change its growth rate or anything. I only move the smallest cuttings from stem plants into different tanks and the only reason I have for it is because I dont want them being sucked up into the filter.
With fertilizer, IME it depends on your stocking level as to whether or not you will need it. In my 10 I use it since its low stocking, but when I try to use it in my 26 I get crazy amounts of algea because I am fully stocked in it.
I think that covers most of your questions right?