When you first start a planted tank you really need to cram in a lot of plants, especially fast growing stem plants, like Hygrophila difformis, or stargrass, or Ludwigia Repens. Those will use up the fertilizer, whether it is what you add or what the fish add, and will eliminate any ammonia very rapidly. Then, after a month or two the tank stabilizes a bit and you can change the plants a few at a time to what you really like. If you just use the two 65 watt PC lights you will have a low moderate lighted tank and you can possibly do without CO2, but if you do that, then the Seachem Excel would be good to add, although expensive for that big a tank. Try reading Rex Grigg's guide for much better information, easy to understand.