for those who disagree with my decision, you have to remember i live in the north of scotland, and myself and some friends are gonna attempt to enter some novice tounaments later in the year, but up here if i want air, i'd have to buy me own scuba tank and adaptor if i wanted to use air, but me local site does C02 for free.
so i'll just run it on C02 till i can afford to get a scuba tank.