Nah... they don't really work and is waste of money. I still have a tube of liq. CO2 if you want to try.
Go for a DIY yeast generated CO2 if you are not ready to invest in a cylinder.
Don't really understand what you meant by manual/electric?
A CO2 system consist of a cylinder(~S$100), regulator($50~$150), solonoid valve(optional, can be separate or integrated with regulator, $50 to $150) and pH controller (optional, $600 and up)
IMO, please get a good regulator. It may cost more, but for the sake of your fishes. I would recommend a solenoid operated by timer. At least, you can sleep in peace without worrying that the next morning your fishes are poisoned by CO2. pH controller is a luxury item, totally not neccessary.
BC
Bookmarks