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Adding CO2 to the aquarium can be complicated, but with the right accessories it becomes relatively easy. Also when you need to attach multiple aquariums to one system, you can find everything you need here.
With this CO2 solenoid valve it is possible to shut off the CO2 supply at night. A reliable solenoid valve that can easily be plugged into a timer. This prevents CO2 wastage, as an aquarium does not need CO2 at night.