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No you dont need co2, certain plants do require co2 but theres a hugh amount that can be grown low tech ( no co2 )
Have a search on the forum for low tech there tons of info and journals
Hth
The bigger the better as 99% of the time it works out cheaper but you can use any size you wish, I think im right to say that most members use 2kg co2 fire extinguishers as there cost effective and easily available
Mark
Yes you can buy using a splitter like below this way you can run different bubble rates
Aquarium CO2 3 Way Brass Splitter for Solenoid Regulator & Cylinder | eBay
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