Okay the deal is they "can" it will just be VERY poor growth. The reason that light is in there is so you can look at your pretty fish. They have no intention of that light growing plants.
Now if your tank is near an indirect source of outside light you could try to take advantage of that as much as you can to help the plants. I would honestly recommend a dual T8 lighting setup at the minimum with the special plant growing bulbs installed. I had that on my 29 and it worked great!
I have a 55 now and just bought a new light for it. It has 4 54 watt T5's. With just 2 of them on it looks like a bright summer day in the tank! Which is exactly what you are going for to keep the plants happy and looking good.
Also if you are very serious abut the health of your plants you may want to look into a C02 setup whether pressurized or
DIY as it can help the plants a bunch!
Any questions just ask...
