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CO2 equipment doesn't really change depending on your tank size.

You will need
1) CO2 tank
2) Regulator
3) Solenoid (shuts off co2 using timer - optional)
4) Needle valve
5) Drop counter (use to measure how much CO2 you are injecting - optional)
6) Tubing
7) Diffuser

If you buy a JBJ or Milwaukee regulator, usually 2 to 5 is included.
You can search on google "aquarium co2 regulator" to find a online store that carries the regulator.
CO2 tank can be bought online as Calros said, or buy one from local welding supply store.
There are many threads that talk about how to diffuse CO2 into water. You should search the forum for more info.
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