Very, very low-light plant suggestions

Here is a list of low light plants:
http://www.plantgeek.net/plantguide_list.php?category=1&filter_by=2
You may wat to post which ones you are getting so we can tell if they are ok for your tank.
HTH

What about shop lights? For about $15 or so you could put a lot more light over the tank. The most commonly available (and least expensive) shoplights come in 48" lengths - conveniently, the same length as your tank A shoplight with two tubes would give you 80W, and there are quite a few plants that would do just fine under that amount of light.
If you absolutely cannot change the lighting, I'm not sure I'd invest in any plants at this point, because they may not survive. Even if they do, they won't do well - if you're upgrading in a matter of months, I'd wait till then, but it's JMO.

Floating plants would be about the only thing(water sprite etc), maybe some javafern on wood right under the light.

Regards,
Tom Barr