I'll reply here; hopefully you find it!
The tank you have now works out to be just under 15 US gallons.
This is the light you currently have, so 15W/15g = 1wpg. That's generally considered low light, and the fact that you have floating plants in your tank means that the light level is even lower.
The good news is that most of the plants you have can do well in a low light tank. Java fern, java moss, and wisteria will all do well, even at only 1wpg. Your hair grass won't do to well, and there's a good chance it will just die off. The cabomba probably won't do too well either, but at least it will probably survive.
There are essentially two routes you can take if you want a planted tank:
1) You can go the low tech route, leave your lighting as it is, and never have to worry about things like CO2 or fertilizers. However, this will limit the types of plants that you can put in the tank. I'm not saying that's a bad thing--there are many beautiful low-light plants out there (especially look into the Anubias plants)--but it is a limitation.
2) You can upgrade your light. With fluorescent fixtures it's not possible to just slap in a more powerful bulb; you need to upgrade the fixture itself. With a tank your size this can be done relatively cheaply by simply adding another light strip if you have the space available. If that's not an option, then you can look into the fixtures made by Current USA, Coralife, or AH Supply for cheap options that will allow you to use lights called "power compact flourescent" in order to put more wattage in the same amount of space. However, once you hit 2wpg you're entering into the range of high tech tanks, and you'll need to add at least a simple yeast-based CO2 kit in order to avoid an algae bloom. You'll also need to start thinking carefully about fertilizers and plant nutrition. If you manage to pump your light up to 3.5-4+ wpg, then you'll definitely need to consider sustained CO2 levels (probably with a pressurized kit) and serious fertilizers. This all comes at a cost, so while you'll be able to have a very lush and beautiful plant-filled tank, it's going to cost a few more bucks.
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