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A good CO2 system and adding free available CO2 to the aquarium, besides a good fertilization, plays an important role to the growth of the plants in the aquarium. By adding CO2 to the aquarium the pH of the water lowers and makes it acidic, just as most plants and fish love it.
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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.