Are they needed? i was talking to some guy about them he said they where on sale so i wondered if they where needed.
Some plants will need high levels of CO2 to ensure they grow steadily. What plants do you have? What is your lighting capacity? Depending on the tank size, you have a choice between pressurized or DIY. If the tank is larger than 30 gallons at most, pressurized is the better choice. You'll need to supplement your plants with nutrients as well as they ran out very quickly as the plants grow.
Check this thread for several links to articles.:)
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