Responding to items from the previous posts:
The single tube light will work, though the tube that comes with it may not be adequate depending upon what it is. A full spectrum (sometimes called "daylight" or similar) with a kelvin rating around 6500K will be sufficient for the majority of plants. The generic tubes that come with fixtures are often inadequate for many reasons. When you have the rube and can give us the info that will be printed on one end I will be able to advise.
The two originally mentioned plants are higher light requiring, though they may do OK with a good full spectrum tube. Stranger things have happened. Another member, Angel079, I believe had good success with baby tears with only one tube and that was over her 55g which is much deeper. You will have to try it and see. Again, when you know the tube info, we can discuss what will work and there is a tube that is more intense than others that I can mention if needed. No point in confusing the issue now until we know what you have.
Not all plants will grow in this or that tank due to several factors, light being a common one, but other issues too. The best approach is like gardening; try this and that if you like it, but be prepared to move on to something else if this or that won't grow in your garden (aquarium). There are dozens of plants, and there are many that have similar appearances so getting the approximate "look" using various plants that will grow in that particular setup is part of the enjoyment of a successful planted tank.
Kym, the purple cabomba may be Cabomba piauhyensis, a very difficult plant to grow, quite demanding. I tried this 25 years ago with no luck, but I knew less then than I do now and I had poor lighting (one of the those so-called plant tubes, useless really).