neil: you definitely do not have enough lighting, especially if they are NO T5 lamps. personally, i follow (to a degree) the WPG rule, as a starting point. where it goes wonky is if you use individual reflectors for your lamps. i would consider getting 2 more lamps, and go to T5 HO lamps if possible.
as for the CO2 setup, what you need is a CO2 tank (naturally), that you can get from either a fire extinguisher supply shop or beverage supply shop. i get mine from a beverage supply shop, and after paying for the initial cost of the tank (20lb one), when the tank is empty i return it and swap for a new one. the benefit of doing this instead of buying a tank and getting it refilled, is that the tank needs to be hydrostatically checked every 5 years. if it's found to be too old, you will need to replace it as it will no longer be safe to use. with the swapping, you don't have to worry about that part. i would suggest at least a 10lb tank, as this means longer times between refills.
the next item you will need is a regulator and needle valve. there are many places to get them. you can check out a few of the sponsors on this site for the one that suits you best (and yes... i'm referring to cost
). from there you need CO2 resistant tubing and a check valve. it is also a good idea to get a bubble counter (of course some regulator packages include this), as this will help you determine how much CO2 is getting injected into your tank. to help disolve the CO2, it's good to consider getting a CO2 reactor. you can either purchase one or even DIY one yourself, which i think is a better route to go. lots of threads in the DIY section on how to do this. i myself have a DIY reactor, of course it's way more exotic than the ones found here
of course, instead of the reactor, you can use a diffuser instead, but after so many weeks or months, you need to clean the ceramic disk in a water/bleach solution.
IMO the rest is really not needed, just more stuff to possibly fail. you can get a solenoid (sometimes included in regulator packages) that can shut off the CO2 supply when lights are turned off, since plants do not use CO2 during that time. you can also get a CO2 drop checker as a visual aid if you have the proper concentration of CO2 in your tank. personally it's just one extra thing in your tank, and i just watch the condition of my fish. you can also get a pH controller, which monitors the pH levels in your tank and will increase/decrease the injection of CO2 depending on where you set it. honestly... this is the least needed item, but others will tell you different. again you can just look at how your fish are coping. one thing i would suggest is getting a pH water tester, such as the Hanna PHEP5 PH/Temperature Tester.
hope this helps!
gravy9: that round pink head was an octopus, and i've got that floating around if i change my mind about this flying penguin
its surprising how much people associate members with their avatars. it says a lot of that person's personality i think. so i think what mine says about me is that i'm a few slices of bread short of a complete sandwich
First planted aquarium-need help 
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