OK, you need to replace the tube, that's all. I have had that tube, it is to be honest next to useless. As you have T8, one good tube will be perfect. You can go with the Hagen Life-Glo, or the ZooMed UltraSun. Just make sure whichever is T8, as these are also available in T5 but T5 will not work in your fixture, and would be too much even if they did. Either of these tubes, on for 8 hours, should be good.
Which brings me to the named plants. What exact is "primrose?"
On the Anacharis, which is the plant Egeria densa, here is some data I wrote elsewhere:
A nice beginner plant in that it is both easy to care for and also easy to help set up a "plant" style cycle tank, allowing for addition of fish. Anacharis is a fast grower, and commonly agreed upon as a very good ammonia sink. It does not require much light or the addition of fertilizers, although having both wouldn't hurt. However, because it is a fast grower you will have to trim it every so often as it can get up to 2 feet in length. Also, one can easily grow a bunch of these plants by trimming the top and planting the trimmed stem in the substrate, and it will continue to grow. Very hardy as well.
This plant prefers cooler temperatures than what is found in the normal community tropical aquarium, and frequently will fall apart within a few weeks if kept at warmer temperatures. A closely-related species, Egeria najas, does very well in normal temperatures (optimum 15-26C/60-79F) but is rarely available.
The "combo," any idea what might be in this?
Byron.