Im keen to put together a co2 system . Have been using a diy yeast system but have found it to much trouble and to small for my 700 l tank. From what i have read you need a bottle , reg , needle valve , diffuser , bubble counter and maybe a valve to turn off co2 at night . The lfs want $1000 + for a system .
Not sure were to go to buy all the bits or the prices .