Agree with all the advice here so far...
For the other question about fertilizers:
Plants need 5 big things to grow, and several smaller amounts of other nutrients to thrive.
The big things:
Light - you have this covered... minimum of 1 watt per gallon for low light plants... with your fixture running 4 bulbs, you will be able to grow medium light plants as well
Carbon - This comes in a few forms... your plants will use CO2 in the water to get this. Without injecting CO2 your water will remain at equilibrium with the air, around 7ppm CO2. By injecting CO2 (pressurized, not DIY on a tank of your size) you can raise the CO2 to "unnatural" levels and essentially kick the plants into high gear. The consensus is the most beneficial level is somewhere between 20-40ppm CO2. You can also add Carbon by using a product called "seachem excel". It works very well with most plants, but can cause problems with others (namely hornwort, anacharis, and a few others) so read up on it before putting it in your tank.
Nitrogen (N): One of the 3 "macro-nutrients" for plant growth. If you have fish in your tank, there is a natural source of N provided by fish waste and uneaten food, in the form of ammonia, nitrite, and nitrates. Your plants will soak up these forms of N and use them to grow. As you add more light to a tank, especially if it is heavily planted, your plants may use up all of the N in your tank, and it may become necessary to supplement the N using fertilizer.
Phosphorus (P): the 2d of the 3 macronutrients. It occurs naturally in many water sources, and is also found in many foods and other organic material. It may be necessary to dose P in high light tanks where the plants are using up all available naturally occuring P. It occurs in the tank in the form of Phosphate, PO4... so you can get a phosphate test kit to check how much P your plants have available to use.
Potassium (K): The last of the 3 macro-nutrients. K doesn't occur naturally in much that is already in a standard tank. Most off the shelf aquarium fertilizers contain K (and not the other 2 macros). It is less harmful in large quantities, and almost any tank (from low to high) will benefit from the addition of a supplement that contains K.
The micronutrient or trace elements:
Plants also need other nutrients in much smaller quantities that are often reffered to as micronutrients or trace elements. These include Iron (Fe), the most common trace element added, and a commonly available fertilizer. It also includes other elements, like Boron, Mg, etc.
Most ferts you find in your local fish store will be a liquid form that combines 1 or more of the nutrients I described above. Most serious FW Planted tank hobbyists prefer to dose each of the 4 categories above individually using dry fertilizers. You can buy enough dry fert to last years for a tank of your size for about $20-30. The liquid ferts sold in LFSs are very expensive in comparison, sometimes costing 20-70 times as much if you add up what you are getting per dose. Check out rexgrigg.com. He has a good explanation on dry ferts, and sells them as well.
In addition to liquid dosing or dry dosing to the water column, there are also "root tabs" available that get "planted" in the substrate under the plants. They can do wonders for plants that are heavy root feeders. They contain 1 or more of the categories of ferts (N, P, K, or trace) I described above.
