First thing first is, what is your current setup? Filtration, substrate, ferts regime, plants. Given your current light, you may want to increase it. But also depends on the plant selection. If there is no ferts regime, then better forget about CO2. Keep it low tech, will be much easier.
2L CO2 tank is good enough for a 1.5ft tank.
Auto means with soleniod, which can be used together with a timer. So you can set when you want to on it, and when you want to off it.
Manual means, everyday you need to turn on the CO2 yourself.
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