co2 system?

virtually nothing - try DIY CO2 first.

There is pleanty of instruction on here if you do a search;)
 
$700+ or $1, depending on wether you go for the super-expensive system with tanks and regulators or a bottle full of fermenting sugar. Google DIY yeast Co2 system.
 
A good alternative to diy is the Nutrafin Natural Plant CO2 system. It's basically like a no-hassle DIY system and comes with a good diffuser. You can buy the sachets or eventually use yeast and bicarb to keep it going. You'll only need one for the the 10 or 20 gallon tank.

Check it out here: Big Al's CO2 System
 

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