Raimeiken...
As far as I know there's no such beast as a 110 watt fluorescent that's 48 inches long. What is the wattage of the bulb you have now?
A couple of things to consider:
1) Unless you have VERY high light (3 watts per gallon or more) you won't need additional
CO2. The only reason for a
CO2 generator is if you have so much light available that the plants are photosynthesizing at a phenomenal rate. Otherwise, plants will do quite well with the carbon dioxide that is naturally present in the tank (absorbed from the air and released by fish).
2) If you add a
CO2 generator and the plants are NOT growing at a very fast rate (like under lower light conditions) then the
CO2 tends to build up in the water and combine with water molecules to make a weak acid called carbonic acid. This can have adverse effects by lowering the pH of your water.
3) Not ALL plants like high light levels. If you've got your heart set on growing high-light plants then you're probably going to have to make a custom hood to house the additional lights you'll need. Keep in mind that there are PLENTY of very attractive moderate to low-light plants that you can grow at light levels of 1.5 watts per gallon.
4) Do your research and decide what kinds of plants you'd like to have in your tank BEFORE you go out and spend a whole lot of cash on bulbs and
CO2 generators. There are plenty of resources on the internet with good information and pictures. Try a google (
www.google.com) search on 'Aquarium plants' and see what you can find.
5) Keep in mind the types of fish you intend to put in the tank. Some fish will nibble your plants down to a nub. Tinfoil Barbs,
Barbus schwanenfeldi, come to mind. There are plenty of others. South American cichlids are substrate-diggers, by and large, and will quickly uproot most plants you put in the tank with them. African Rift Valley cichlids like very hard, alkaline water. Not a whole lot of plants will do well in a tank like that.
6) Plan....plan....plan!!! You'll save yourself a lot of time and aggravation in the long run (not to mention...cash!).